Malicious PDF — malware analysis report

Static analysis result for SHA-256 9197927ad198bea4…

MALICIOUS

PDF

91.6 KB Created: 2021-10-10 05:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 62e49b99d71e77fde77fc6876abc873e SHA-1: fb5523a2b8b0d5be968f8f96a6e34d48e4228f53 SHA-256: 9197927ad198bea4ad8d85ccb3fe3ff0cb71e3d02e739696a05bfac4965cc2ab
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://cructi.ru/uplcv?utm_term=side+length+of+equilateral+triangle+given+area PDF link annotation
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/fkb2trb82un172dp96g8ncgls2/tuderofekeji.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/gedaxona.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/38841160203.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/wajokumases.pdfIn PDF document text
    • http://idcla.net/upload/files/bofaf.pdfIn PDF document text
    • https://eliteprotectiveservices.net/ckfinder/userfiles/files/dotoxifufanoxijano.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/dohf4q2931j68g8enq2t4bdkbn/varijebaro.pdfIn PDF document text
    • http://battle.bpv.su/content/files/files/pasemawufomego.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/41991644714.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/dezudopetububonerer.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/safoxagokawemaras.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/bujabasitomapogewato.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/pebofaxu.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/81681180793.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/38751564977.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/padunarisunogozoz.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/punizevefuwubufipufisu.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/b6d44bce542d78a10dd4f70b4d532ecf/nogigewi.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/jufekug.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/99873661835.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/91958989924.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/tepetibarekor.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_off0000f630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E42 22408 bytes
SHA-256: 809619c8f89928af07f41b143da9dabed2372a7ff1ec5ac1bee6cb56f4e6e297
font_02_sfnt_off0001484d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1484D 10852 bytes
SHA-256: f0ea2a2627e1cffdae3dda8f4acbe6cd4ff9bc8b42fac505378857e2c1c23f1f

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