Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0f70dadbc115d9…

MALICIOUS

PDF

90.1 KB Created: 2021-07-28 01:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0df859991efd3d9700058099d273517f SHA-1: ed2247b2ffa03c70d95120696b53143ff91f89e8 SHA-256: 4a0f70dadbc115d903dc77c9ab3e3adeee415997cb914e4cc89ce2d3fb6c104c
176 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or callback scam. The document body is heavily obfuscated, but heuristics indicate it functions as a link farm pointing to compromised WordPress sites, likely to host malicious content or redirect users. The 'SE_CALLBACK_LURE' heuristic specifically suggests the document prompts the user to call a phone number related to billing or subscription issues, a common tactic in tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7163d08fee---54546741691.pdf In PDF document text
    • http://analogsys.com/uploaded/file/1344631890608a679757e68.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160712e672e252---80914562101.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/n4a317rbspbfhs4cktde9kp02v/53286538194.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/58121246362.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/bo6vipel0p7lspjkgbujb02um7/99161535983.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210605105423.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ae3ikfs89jv05ei0oll741vf88/zarewimigugilodedidizunu.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d49a31d36f---ganuxezekogixibe.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/75594047306.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/vozozilimibaxizufaj.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/64019166338.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/24327211636.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/914r2g8uo801u7v5u5loubf531/sageguserufobumikan.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/88558023633.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/tagujegodofu.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/78965952208.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/bo57bv4sqtpq5cdt6tirmqhai8/24948365368.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/majumuraxeru.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/27289479494.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/jawarubakegusid.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00ebd80a10---39886494158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+cancel+virgin+gym+membershipPDF 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_off0000f7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C5 17792 bytes
SHA-256: daffced39b7de7f846447dde593bc7754848858c0f1bc29e8b1a1e79a8e48c3f
font_01_sfnt_off000126c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED7 11216 bytes
SHA-256: 815b7847257712a6f4ba97bad28b0d00242da157422d882a46518b1dd5c905a2

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