Malicious PDF — malware analysis report

Static analysis result for SHA-256 831aae96e499556f…

MALICIOUS

PDF

79.5 KB Created: 2021-09-22 10:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 419eee720c1a5d4f5ab7889ce11fe647 SHA-1: b32f72eb345ab12ca3bad27fc0a4d6b9d7f799b0 SHA-256: 831aae96e499556f7abdf4cb49ef589558157fd1b5be8ab94c89638191064da3
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various compromised or disposable hosting sites, many of which host other PDF files. The presence of a 'Password-protected archive lure' heuristic suggests the document may be designed to trick users into believing they need a password to access an archive, a common tactic to bypass gateway security. The embedded URLs, such as 'https://philabc.ru/uplcv?utm_term=gta+vice+city+j+cheater', are likely part of this lure, aiming to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=gta+vice+city+j+cheater PDF link annotation
    • http://mylodge-naoshima.com/images/blog/file/fibejedoxuweg.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/8785403869.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/13575989870.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/27748886527.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210921090454.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/dodomivodogisobagisafu.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161498f4daf954---milerikibapetifarulowefa.pdfIn PDF document text
    • http://vhz.cz/user-files/baxobonukenefugo.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/24849490621.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/papovivasi.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/80975776966.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/93e8ac0682e2c059f34585a798ed49c7/41688058720.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613954d65d1fe---fogisagufojizepe.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/318434641d8917a16ec72c53ee92a635/gapizakeworex.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/f220127115756d2c3b0126b7f73d1575/89094172413.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/74369006335.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/tikadob.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/3363893499.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/vugesemufomuzix.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/mavubujukomemogeludig.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1614060921a80e---dedolafedulukakugib.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/nubojulejitajawezefer.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/mewuxik.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_off0000c8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F7 10236 bytes
SHA-256: 2700ec200bc9df55802243583ca4443e279c62a63f7c6a4f1c611b4fa994ca98
font_01_sfnt_off0000e018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE018 21708 bytes
SHA-256: cb8701332bb9164bf3de34bd5e57849ba82f10d1297aa27bfd399f9ad65a66e2
font_02_sfnt_off0001183d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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