Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ced86d485182cb…

MALICIOUS

PDF

84.8 KB Created: 2021-09-05 03:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 51bdc3d1bfd7d4eb34318785903bebd3 SHA-1: c55da2baeff901e6b121352b80c7404dabb2ec4d SHA-256: 85ced86d485182cb370b7f38b921dc9d23ff87630c8c99beab4adcdca88cf034
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate high maliciousness. The heuristics indicate the document is a link farm pointing to potentially compromised CMS upload storage, and it contains a callback phishing lure. While no scripts were extracted, the PDF structure and linked URLs suggest an attempt to redirect users to malicious sites or engage them in a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://by-express.com/upfiles/editor/files/rilosupotemuru.pdf In PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff8e172554---petofaxegagereko.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/80202440420.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/gimaligewilofiparajadesuv.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/19817544497.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611481ea49946---xixiwogilebovusugeko.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160988af012df6---20508444738.pdfIn PDF document text
    • http://udemadriatic.com/userfiles/files/jidodudi.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/824o3273rttetnfee0nh0p75d9/56064435100.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/c9uugitn1j639il3gnh2dc3l9r/35755635407.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/40399998269.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/3157998875.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/34449719342.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6ec24722a9---79800959044.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/21442640337.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/59340955330.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091bcbb7ca7a---58048273402.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4599124be---49431462403.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe644eda37---babumedalezavo.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/52093660452.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/gonumobawi.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/padefanamejojom.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/78443097387.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/28019011030.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/6593176181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=que+es+ciencia+forense+pdfPDF 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_off0000e1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D7 10628 bytes
SHA-256: a42da79159b580b11efe52636ea50794f6552884f3b743572a1542cfb7fd29ff
font_02_sfnt_off00011258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11258 19788 bytes
SHA-256: 0f049b85d50e44e83fec0b2bd81e8c29dd79a78b7ccca8e037b1b61ccf97f098

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