Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cec02411629a6d4…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 20:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 68bbf27f3fa2771cd3e0a771cfaf176d SHA-1: 8061a83c135302e622ebdd3b24922ed9d4072248 SHA-256: 1cec02411629a6d4a6cd17a4eb908d694788da4be76fd6bf3194bd2ce3bd50f9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. The document contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic specifically identifies the document's intent to trick users into calling a phone number under the guise of a support or billing issue.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=zombie+squad+hack PDF link annotation
    • https://thucphamtruongxanh.com/Upload/files/70867869015.pdfIn PDF document text
    • http://warehousetraining.ie/images/tefuvipekujebilujowepaw.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/zefowuxoxire.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/66817106934.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/71563074437.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9ba62e5da---rawowum.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a20003fb72---98541247601.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/71355225118.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/duleropoxej.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/rudibemaxigevebuva.pdfIn PDF document text
    • https://revive.fashion/upload/files/jukukeguxe.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/06clmroden175hfit04pj2te0c/sogitawejexu.pdfIn PDF document text
    • http://runhouchem.com/upload/files/dexidebedomoriji.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/solosoru.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/kosezozurevukeg.pdfIn PDF document text
    • http://trinitysportsandleisure.ie/userfiles/file/dabutibovoxakurevu.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/92679935231.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-19/20210919060703445030.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/161476b838edf7---wawajizawa.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/ronejomol.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/jesiw.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140542302cae---92168498963.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/6179503015.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/774785436ad93e0f97bc5f0096b6ad94/91166668895.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_off0000b18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18E 10728 bytes
SHA-256: 8b849cdad575d371e4ca23ca11550b1ebf12e9cb122515ceaa43fe63dbafb265
font_01_sfnt_off0000ca03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA03 17904 bytes
SHA-256: 7852fd072e31f7eca2d03d7f449729f67e6fa3589b40ce0f9118054f543ea55d
font_02_sfnt_off0000f850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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