Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df05e3d4798b341…

MALICIOUS

PDF

77.9 KB Created: 2021-09-16 17:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4f54564e0637e64918b28796b61fa383 SHA-1: 5786dbc7230927522442663117ec2c66387a6114 SHA-256: 8df05e3d4798b341b49097131f8304765b4ad3a675d303839d64e053a60ffe01
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains embedded JavaScript and numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=friv+all+games+2019 PDF link annotation
    • https://salondumariagededijon.com/userfiles/file/26561894275.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/lorazoxudo.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/wevutedokupuvopujojubami.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/031bef953be512ae4d79740ec9d6ebc0/wolorilenidokam.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/gafijenutirepa.pdfIn PDF document text
    • http://osayit.com/images/file/xubakilusegamivom.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/wedaxawojizatenaxupofem.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d044ce8140---gegesiv.pdfIn PDF document text
    • https://asiapharma.la/files/files/rigezoxorawukemeguzinol.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/60355394364.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/rifuzobinelolenufififa.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/63674596562.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/zisutikoruvu.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/kegujepov.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1630835018dovevenofu.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/1600834544.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/31533668591.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/xezagovimefuwotodefu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1cfc53069---melufofesuwekamupit.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/73346629275.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/32005736823.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109140509131114.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/88149912519.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/83294425007.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/22650666018.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/57174350655.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_off0000ccba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBA 10636 bytes
SHA-256: 8564383fe97edb7181d637d3dc3b3c1a06870eb8f9bebeaf51003e88cae671ba
font_01_sfnt_off0000e528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE528 17416 bytes
SHA-256: 65d75541e349615243123e5cb607828f403e843a2da1c7c2dc389962cd12befa
font_02_sfnt_off0001125e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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