Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9787b7983d8f85…

MALICIOUS

PDF

84.8 KB Created: 2021-09-01 07:38:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f0dfc4d533b41802196b2614add21081 SHA-1: 38570e9690028683c63861237e3d724743974862 SHA-256: 8a9787b7983d8f85180521539b637d7b12405d6a54da0e100b2a97351c016664
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. The heuristics indicate it functions as a link farm and a callback lure, prompting users to call a phone number in a context of billing or fraud. While no scripts were extracted, the presence of numerous embedded URLs pointing to compromised WordPress sites and disposable hosting suggests a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://krisoc.ru/uplcv?utm_term=mail+on+sunday+crossword+answers PDF link annotation
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/7tuj9rl2lt9tq26fp4k8dfhu04/nazigumedari.pdfIn PDF document text
    • http://kco.su/userfiles/file/pirexomosemizom.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/96618371510.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/25207864051.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c73d33f66---29367209421.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f04b93e11---nepekupidonevitimidog.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/14734991485.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/tobozil.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16115bdc9265f7---lifegirudatubobazimepo.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16120326a77b9e---54288970126.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc1d1ae98ae---xibixilebupej.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760a2c833f2---suser.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/7924609b0f2de53dcd7121ef4b0d5a40/nabotatinidiji.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/78544368818.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/42682360096.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/37776538564.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/fofeledope.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/143b7831a85f6648cefebd3a61e4fc3a/72337050571.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/13479396744.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/c95bf5a7ef8b3e23baa8c21026a895cf/kuzibitifig.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/6cfbf8fa760675b5b2e8c54ba3a45d77/gefevapabot.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/vokodadodadus.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/mi499pl1m6gd66bfnpiftjec34/67953903150.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/futukegoregepixaf.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/vazakovodaxesurur.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_off0000e6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CF 17952 bytes
SHA-256: 5065dc606a4a4e9aca099d71cdac239a45de7b80d0675d0b5d70e0d51f25d689
font_01_sfnt_off000114e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E7 10560 bytes
SHA-256: 67d7e6fe8d47fb1d6538c37fd13ea9f1ea5ab08adba7cc177c907351709b3204
font_02_sfnt_off00012d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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