Malicious PDF — malware analysis report

Static analysis result for SHA-256 1899ea41ca61b278…

MALICIOUS

PDF

125.3 KB Created: 2021-08-10 14:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 46619b12fdac5464870c58b43a17afe9 SHA-1: 64a1b701ab02da3e25ac05974e28ecb87f6f779f SHA-256: 1899ea41ca61b278685c52bb83ef1cf6a594a582c7d869eb78a105a1b79d7d40
276 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

This PDF document exhibits multiple indicators of malicious intent, including being flagged by a machine learning classifier and ClamAV. It employs social engineering tactics, such as the 'ClickFix' lure, to trick users into copying and pasting commands into their terminal, likely to download and execute a second-stage payload. The document also contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/uplcv?utm_term=logitech+mk710+arrow+keys+not+working PDF link annotation
    • http://jingluo.net/uploadfiles/files/vezufokurokofovopulata.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/0c8970702f062b30c3a8d97aad5a4062/xebejewuzif.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/epc1fdk0ag6rpm360jddej28bl/49939132696.pdfIn PDF document text
    • http://premium-h.info/files/files/33886971477.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/wilinajigobakififadon.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083077bbe3e0---64426992838.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/vapifiruj.pdfIn PDF document text
    • https://chpcentre.com/files/file/warezenalo.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d63b81144---buneduwamizebogomuk.pdfIn PDF document text
    • http://chobacgiang.net/webroot/img/files/25245082930.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/1a406fb0b77a957d8cbe1bbcf62c131f/fopodukegonulusefutuxika.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6e5bf2626---ronuzexu.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/80089735774.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/d48sl8vfdap4us71qrhft6h2a5/6083164436.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/784483d82a819fd9790eae0e7e79be6b/94252216886.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/91a619e24eb3193bd8c7fa528acef205/35109971524.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/jatasija.pdfIn PDF document text
    • https://tajeer.co/userfiles/file/fozodoxeboritogufurigab.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/68estpcjbbnubb9gomkotpn49s/zetebawulene.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/45388221452.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/delelijagodajupojekakapa.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/06b2445d35c482b83c6f5d62f24737c5/71441099205.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/tu03c82c5nmqh0fd3dm4qca38dld9lbe/62168943695.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/2020227886.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e266ed9f61c---68725448015.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AFE 11104 bytes
SHA-256: a731ed1dcb015d13c92f2b3874ae474a23dba3ece63cded882117f815451a2d5
font_01_sfnt_off0001a4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCF9 15900 bytes
SHA-256: aec8b0b2b3b9e2eb84ee194a33a54fe1a1da46c4d8a68b4ae630084f4d76e888

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