Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6492944ca4b3fe…

MALICIOUS

PDF

91.9 KB Created: 2021-09-22 09:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d14149a0dc2024550f442d04943c5bb SHA-1: 1209920fd88183b78e41a71afb219a8339f67ed9 SHA-256: 7b6492944ca4b3fed79a954b4d0e730348a396baca728fd4b1944454cacce6ca
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains heuristics indicating it is a malicious phishing or trojan delivery mechanism. Notably, it employs social engineering tactics ('ClickFix') to lure the user into executing commands via Win+R or a terminal. This strongly suggests an intent to download and execute a second-stage payload from one of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 8

  • 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
  • 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://smidgel.ru/uplcv?utm_term=next+tab+shortcut+key PDF link annotation
    • http://majedalkarkhi.com/pics/file/wadexijexaw.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2a59577a21741ebde1e402a5e18fdce6/jinanokiba.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/82076674830.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/83749111283.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/40700574764.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/nazuwopowininusosek.pdfIn PDF document text
    • https://chineseclothingonline.com/File/taduwitet.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614acaae43651---99618361414.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/94765348664.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/liloxemididedimodaxuli.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/zifugomurulijik.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/nurimalarinizibafotedi.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/zijumogamesobovow.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148fbc969ed3---xuvelas.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/70484146311.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/dakuga.pdfIn PDF document text
    • http://esejsc.com/upload/files/80379459243.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/51406574034.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/92412015338.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210911041257185.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/1a6760c4112738acd053fb965f5c8a8c/bobaxikefojo.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/92787153984.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/bulizapavate.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_off0000fc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC42 10612 bytes
SHA-256: 4b77430112348fa40f95cb7ce1ef8d4d6563f27f6458d468ba0413db59f1d50b
font_01_sfnt_off000114cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CF 20380 bytes
SHA-256: 168d77f642f7e4aa84b1d1afa71a93d1b31a33a5bcfec0d8a3a783abb24e0c06
font_02_sfnt_off00014a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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