Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7031dd0bb72cb6…

MALICIOUS

PDF

86.7 KB Created: 2021-09-10 23:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d3b231f17d4cabba2fe0542bb589cca SHA-1: 8a5a45d7d7f8a8f96249ff1f359ee147fe9fb8bf SHA-256: bc7031dd0bb72cb6341a240b25641bfbb5306beb3f1d417943cf4cf7e4844660
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs, several of which point to compromised CMS upload directories or disposable hosting, suggesting an attempt to lure users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://baoyi-chuck.com/ckfinder/userfiles/files/46260113460.pdf In PDF document text
    • https://hospvetcentral.pt/site/upload/file/58444183501.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/25720371044.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/68709927936.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/jojibomefebefutedewixuwu.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/wurimid.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/55488290598.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/xubomulelitas.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/26759215172.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/67082036989.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/83463624523.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/jonixosufiwi.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/xowabibozelafaxuzasumezuj.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161384213c3898---tovamoradejurob.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/noxikuravul.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/698ff4ed37b9b4cbccf60984e3b5285d/zososeparuvufufamezuwep.pdfIn PDF document text
    • http://marketingnews.fr/images/file/24541234613.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd8a77a01---64752579333.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/96567480646.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/gufukesetubom.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210911034858.pdfIn PDF document text
    • http://schubert-hh.de/image/file/wumavadobakip.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/kijuwo.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/58387347312.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/16628676542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=demon+slayer+season+2+moviePDF link annotation
    • 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_off0000e9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BE 19748 bytes
SHA-256: 81e28dcb1dd37d920ca2bae664f71933592e01afc5a1ae4e3024599308f8e613
font_02_sfnt_off00013547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13547 10472 bytes
SHA-256: a0d2f167ada73a7000b46036e2025f065b035fa374e17684c6f7da18d6f0b516

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