Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc9af946dcf9632…

MALICIOUS

PDF

90.6 KB Created: 2021-07-31 00:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e02cb8fcf7e57a177e2b6d93cb1967b0 SHA-1: 313c3c9dec85bed4780008c8d28bae606fab01cc SHA-256: 0bc9af946dcf9632180ae32c26ada05f94b31bd8aee0944f7f1276b3ddc854b8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a link farm pointing to compromised WordPress upload storage, suggesting it's designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic further suggests the document's content is intended to trick users into calling a fraudulent number, consistent with phishing or 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://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a5c0883bf---vetujoba.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/0s2dvm80gc3su7r8l2422r3fnv/refumedikikanetewase.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/ramiju.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/pagajebakupiduvoredadi.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/48139652194.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/wawisunelazuzaxuted.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/4143809307.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/1f5b27b1c7b5863ede7b66fa0f1c3c27/ligipimurowavofolawud.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/19617677719.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/gajasudaloped.pdfIn PDF document text
    • http://btfa.tw/upload/files/jafumopexasutamuwudisa.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084a951daec0---nopebexurorevena.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/90930151623.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f49e0166f---67882254571.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/voxanugatuzarusoku.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b865d9770e8---jamajerotudarusonede.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948f7e587a1---85080273086.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/36314823261.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9cd0d9778---5184584981.pdfIn PDF document text
    • http://minhanh.com/files/36848747623.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/6db26537b42433cd2588ec3d6e460a58/zusunifekuligozuberon.pdfIn PDF document text
    • http://federalwayhighschoolclassof1970.com/clients/8/8c/8ce2019516a67423f07d8eefa67dd611/File/3038831130.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/d2e747a7d1cb5ea10ee0ea3d96625a30/tevanipesaz.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb76ba381cf---28588349752.pdfIn PDF document text
    • https://pcstaiwan.com/ckfinder/userfiles/files/wunanikek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+stream+p90x3PDF 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_off0000fab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB3 10812 bytes
SHA-256: 9e9c991b30e8fdbcb8279a12cb345d86b079ecdf0b10fd028d3bbc546c2b2507
font_01_sfnt_off000113c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD7 18584 bytes
SHA-256: 54c73cc84924e9992c7d216c89d1a94f1f9563e5799a24a63a08a9c4e19b979d

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