Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c26010dd127ba1…

MALICIOUS

PDF

85.8 KB Created: 2021-06-28 16:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4a6ed755c5bfe48d4a6a78bfaa5fed10 SHA-1: 8e118a235423036b3c30a33f485a790c6e0785cd SHA-256: 98c26010dd127ba1685afddc182690ca411791a3af7b921f0d3c38b1abf03112
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and disposable hosting sites. These links likely serve as a lure to download further malicious content, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aebb04e6e15---84664407294.pdf In PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/1962865742.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/lamulale.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b154fb498d30cefe9620c7650b4ae484/40084026666.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/tebuzijezivijipivojasejib.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/qs3fv4trksq8ge46bhilqv4j4u/59418796766.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/zumefofejilu.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/22837129276.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/lk8eqeogll4c79chl039771jem/45253289562.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aadd2ddb127---visexepikulupox.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/086358cb7319b5b2b7b6d4d6d7a9437d/90705128776.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ac0c0c575ec58e174d799e3cac3b8f05/66593258347.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/butodekozalajelisositonid.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d02bba3c6c9---vodexisosanatopi.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cea5bfd26ce---16745485315.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/93484926124.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160798f677bde0---3582611386.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/rerebamixuzosenigoveni.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf847739d8---55528751174.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/32257937822.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cc24fb166c8---rofatemaxa.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/28e91a318d3e4dab8642bbc36df41f2f/lutokiguw.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/ladaxetakelezikawaka.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840539c19a8---pevomilela.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/68408384650.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c89208417---96176403573.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/60ab94c38a20bb201edfaf30a2dd836e/96255561392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=old+camera+instruction+manualsPDF 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_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 16488 bytes
SHA-256: 70044f36f162ed1bc682031ecbfb44d0c29dd2069834f0389b3c7c10e5317f23
font_01_sfnt_off00011925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11925 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001313c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313C 10656 bytes
SHA-256: 5ff31726f13f7fd6c730cd19f9aa3b3fd30b6052089b4a17933479abb9642602

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