Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc71467e4ac90f8…

MALICIOUS

PDF

88.2 KB Created: 2021-08-18 11:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2e043e93304ce366ef7eb111bace088 SHA-1: 130bedc50d8280e673e60c423ef86b3c3b2419c9 SHA-256: afc71467e4ac90f83afaf951e270af974582d7712f40621237d3668455413640
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URIs and the nature of the links indicate a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://akvari-um.ru/userfiles/file/dolenogegazuwufi.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/amcacuj4dc1heinep6338f075m/57836826084.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/2befh9qr2nqc1vj8u51ftpieu8/22759275245.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/ueq34pf479jgv31bm3jpiu7ms4/doxulemimedajeka.pdf
    • http://coumert.com/images/file/satefuwedumoj.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/0ud93es3sft0debsja1ppmc7e0/jubovozadu.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/a91f9ba313e7d703062f8228710c7d41/19223169646.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607df8248b0ba---79391621772.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6b99eb11e---jireburemozezilovomasab.pdf
    • http://onlineticketreview.com/images/file/55131385599.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f05be91314---zagadimilewaxojijejir.pdf
    • http://lorichphoto.com/pictures/file/27403059531.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/95ca197a25d9dbe49e68366b44c19493/97144605380.pdf
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/28108313855.pdf
    • http://suacuacuonthanhhoa.com/upload/files/38136895971.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073fa3202e4d---xamimokovutotem.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/fanalepakenoparivebuxo.pdf
    • http://dmhu.eu/uploads/uplib/file/temomivadumomuxasetalola.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/d5p64oih5ft591eo3nu41rrago/80609418621.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/bc159b13ae8e15b82b4312720f8c4ad5/metopovob.pdf
    • http://www.tobywells.org/media/fckdir/file/86821587375.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608197221c187---mokipanu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=jumanji+2+yeni+seviye+t%C3%BCrk%C3%A7e+dublaj+full+izle+film+makinesi
    • 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_off0000e885.bin
09362c6e21d710ed9a6607eb6439c0dd2fbfd4ca82bb91c7fdd2c580c51cc33e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE885 11600 bytes
font_01_sfnt_off000103cf.bin
a16cc4f34b6317ae4ac1c78fbff6eb20c75f638227e82f3a300a0eb3dec3c905
pdf-font-stream PDF embedded font (sfnt) at offset 0x103CF 20644 bytes
font_02_sfnt_off000136de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136DE 16792 bytes