Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4ff7096d4499e7…

MALICIOUS

PDF

75.9 KB Created: 2021-10-12 13:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 95b524931577c4ecf9ead4c63d72dc61 SHA-1: c412b4569d34feb4c8cbcb1022feb04d194205c4 SHA-256: fd4ff7096d4499e79c2fcbf4020a4a3b42c82668b8fa4e0312a66a208c9b71b9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of phishing and trojan activity. The document contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to distribute malicious content or redirect users. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in tech-support scams and callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://z87992961.com/upload/files/20210917125001.pdf In PDF document text
    • http://capitaldanceacademy.com/userfiles/files/bifulumakifemomupak.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/33390136572.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/94169643971.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161632a6354bc7---68101798521.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/perorom.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/18123097906.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/livubogedeb.pdfIn PDF document text
    • http://proxima-online.it/public/file/18563042107.pdfIn PDF document text
    • https://drgcode.managenet.ro/images/file/41019956857.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/22360043631.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/53460883384.pdfIn PDF document text
    • http://vuason.vn/upload/files/zogutisofes.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/bakojigipupifekotoveluluf.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/77450702798.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/kilexijedu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16164080aae874---59591897553.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/fegunefalij.pdfIn PDF document text
    • http://northamericaminingexpo.mininglifeonline.net/file/YxzxkdNNqD1IwqdN.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/57170093293.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/1tnrp1asct2i9ob2mk5ujor0h7/nijarepivukofojupanu.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/HKUGBsJGI0E/uplcv?utm_term=omd+one+meal+a+dayPDF 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_off0000c4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DC 10088 bytes
SHA-256: 0e4ce215b87ee93318c8fd3a795d1b2b2ee26e8ee5c43217ac03eb1f53b50c08
font_01_sfnt_off0000db51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB51 18236 bytes
SHA-256: c51aac2623bdea9df63d3774e2c991e5debe28ff13d75c8463ac76cbff0465ca
font_02_sfnt_off00010a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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