Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8a0deaffeb77cf…

MALICIOUS

PDF

77.1 KB Created: 2021-09-05 21:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 961c84172fac8206eff94171489cce09 SHA-1: 29f107899a0f8b671a059322637f6ede35ed2b24 SHA-256: cc8a0deaffeb77cf2bcdd08564051357a71b26b765b553e516d92ee920f8b883
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on disposable domains, a common tactic for phishing or distributing malware. Heuristics indicate it's a callback phishing lure, suggesting an attempt to trick users into calling a fraudulent support number. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610689b6195d1---jozinifozozigevesasavof.pdf In PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/modizobizotezagarawomafe.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160798e0e3db78---temonuwuretuzum.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/10425180226.pdfIn PDF document text
    • https://kham.vn/userfiles/file/perelotakofuv.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/31497174960.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad0816fcf---41191393007.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088ae10c0542---sanutolenaperalob.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e43cecac998---41009601167.pdfIn PDF document text
    • https://shopabrang.com/images/files/78530901244.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/durimujetufiguku.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/50dc7db624baac7f645538e2e7fe599c/3460071780.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/zikok.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/zozorujuvagome.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/49961331504.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac31ec94fbe---33274188771.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/61717571242.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/powimus.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3389ae605---rosidivevoxijunesekol.pdfIn PDF document text
    • https://clinicscrm.com/img/files/66119504590.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/81786628454.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5ec3d0e6e---9564692335.pdfIn PDF document text
    • http://rajeshjshahani.com/clients/d/de/defaee86e9f1fedea086b53a5072ac2c/File/jamojebowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=sony+hdr+cx405%2Fb+manualPDF link annotation
    • http://irodori.kir.jp/files/file/16179316055.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_off0000c7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEC 11044 bytes
SHA-256: cf96adc484a10360d4a08cc4b17951483ff1eae0c7cb27c8ef36ef8402274d92
font_02_sfnt_off0000f98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98D 17396 bytes
SHA-256: aed426ca37c1e724fb37ca62ad4c726721582ce29aebf7326bbd030a8ee23b72

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