Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9685e86a1c0923…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 11:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c085bd563c43259ec00d33341855c896 SHA-1: 2d434095af1527787385cb84bd2ff13c92a5d136 SHA-256: 7f9685e86a1c0923d7a92da08d8619eac340f96e8077881d856f1d67957acdd5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using disposable hosting for these links, further reinforcing the malicious intent. ClamAV detection as Pdf.Phishing.Trojan confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160726747e383b---8334201627.pdf In PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc391164c24---40929533839.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c7536edf6b6---zerazezawezoxibatene.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/jivojuloxovavule.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/c9f554b2e7a45076c6c27215815519f4/dagodowipojilutafos.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/6a76dd523dec278d1ccac6526459cdf7/51656425327.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/f122261acabd3b9136deb3ff1149f6e7/dawetakazazudig.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/sejugobufutibavas.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/dinopigu.pdfIn PDF document text
    • http://plncse.hu/php_data/file/53175344868.pdfIn PDF document text
    • http://alohatoypoodles.com/clients/1/11/1122824db0f83c9e74cf39311881f217/File/gifipopu.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/48f72fcc66f0b530aa4c7132778b26e0/jivazobimis.pdfIn PDF document text
    • http://qca.ch/userfiles/file/12092473535.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/zolanurepatexonubetodo.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/68415366674.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e41cfb72d41---zinetolazasesudumub.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/zituvefufazujinuxojex.pdfIn PDF document text
    • http://thecreditcrisis.net/clients/73966/File/5683293190.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/94633039374.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/xalerejatogaz.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da0538c413a---vaterevurabapulom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=appealing+parking+ticket+templatePDF 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_off0000e3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FC 17280 bytes
SHA-256: a05904a9c1991647edf5ec7e3eeb011beddad87611d37bbe2d0e1489a9080e7a
font_01_sfnt_off00011089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11089 10500 bytes
SHA-256: 94bac3109dba133c846283fd40f695e2d3c84feb3ba74c98ee9b8c9ad362eba6
font_02_sfnt_off0001286f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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