Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f0c18a553f6f3e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 14:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eff8a152fb996b7dcae9ba349fd9fd48 SHA-1: 35abf254589d5336bb5ec1337643870621faa9dc SHA-256: e8f0c18a553f6f3e7a051cd6941aa651c1a9882f9d760848a693dfa43dbb3391
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of 'LOLBin token sequence in document text' suggests attempts to disguise malicious commands or URLs within the document's content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://ajtoablakcentrum.com/_user/file/69572727171.pdf
    • http://edeins.com/userfiles/file/dimobiduzetitojop.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135ed4e1b3f3---23039580425.pdf
    • https://yantrasearch.com/ckfinder/userfiles/files/89045960547.pdf
    • https://imaggu.com/ci/userfiles/files/safiboluwud.pdf
    • http://yuilchem.com/userData/board/file/35535210166.pdf
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/taxugumumukixaxet.pdf
    • http://salamatekhanevadeh.ir/ckeditor/files/files/vinajuzonaxabagup.pdf
    • http://anhuifan.com/upload_fck/file/2021-9-2/20210902103301959586.pdf
    • http://ecohost.ru/pics/images/file/35861322156.pdf
    • http://charmingcurls.se/upload/file/94631157817.pdf
    • http://standdominica.org/files/files/5856083540.pdf
    • https://u15.ch/ckfinder/userfiles/files/5418967608.pdf
    • https://ylwlgwadmin.ylwl.cn/upload/files/gizevozowofaxominoxefiz.pdf
    • https://art4you.sk/editor_uploads/system/files/mimepidomoforamaruxigiju.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/eksjpme8ecuc7lv0tp7q6ql5q2/70796811799.pdf
    • https://hotelindigha.com/FCKeditor/file/36335274825.pdf
    • http://agataklimowska.pl/userfiles/file/nolivuf.pdf
    • https://vipbeachhouse.com/uploads/editor/file/wolivadisotugi.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f79a5114a9---24366413741.pdf
    • https://citrasas.com/ckfinder/userfiles/files/98915962512.pdf
    • https://bursac.net/userfiles/file/52172364751.pdf
    • https://yaslibakicisi.net/userfiles/file/letuwoxajoxawonidajepoj.pdf
    • http://standdominica.or
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=watch+men+in+black+online+putlocker
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6d1.bin
2abc1d983429faa2e747337e943e5a1443c4a202f2d154327e57a2c7efb6f481
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D1 18188 bytes
font_01_sfnt_off00010652.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10652 16792 bytes
font_02_sfnt_off00011e69.bin
7e233c2878dd70406d9cded21ee3ac81b77a6736ce4db330920d580e660b1ad8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E69 10796 bytes