Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8cb933f35164878…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 18:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 21b3c266e9262249d7efc497b60e2aec SHA-1: 55f8a7ca72115a201314e354fa831ee752c7b09f SHA-256: d8cb933f35164878f579eb54070d2aae741acdf183a0bf2be26e645cc77a1a16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 6

  • 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.
  • 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 http://gzperson.com/uploadfile/files/97902639952.pdf In PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/525cbd376549641f1332f53eb11ce170/82372343878.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/69610443588.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/69999635025.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/29419260213.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/luvemobiboxisinesuma.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/faxagesegopovumoti.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/magerofisabeda.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210906032722.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/55084672727.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/8376512579.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/sumis.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161403edd773ef---87448241389.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/58135022396.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/monom.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/56532881887.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/loxogut.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e63a80508---1752810537.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/94694655777.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/05coqc6ft9l5jj5uvd3lpulug8/rimijevamexefiko.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/af1b009119fc323921d49512e312beec/53650009596.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/kabejoxi.pdfIn PDF document text
    • http://zuszdounky.cz/files/fowodegadusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=jeepers+creepers+3+yifyPDF 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_off0000ae09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE09 10220 bytes
SHA-256: f39b6a6f808ee2f24aef1cfd55ce5f6770612cc21841e592d57952b6d92fc5be
font_01_sfnt_off0000c525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC525 15996 bytes
SHA-256: 1da2d2b0228a1e48bff2c083bc65a958aee86899161f3597d20a3aad024ea3ee
font_02_sfnt_off0000ee16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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