Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f8f141283cece2…

MALICIOUS

PDF

94.1 KB Created: 2021-09-04 06:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba054f724bca14f591243813e4c8655d SHA-1: a5d84bd47e499eb41fdc864ae508931b5eb95096 SHA-256: d5f8f141283cece2a61cd1c69e555a7e4965918e7fb16966720e4af91f39cfec
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://kolesnikov.pro/ckfinder/userfiles/files/48455504432.pdf In PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608743edcd900---1709854633.pdfIn PDF document text
    • http://geose.ru/userfiles/file/kofasafebujozoberafixo.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/59308411923.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210805024642.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/86941581294.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/11844332656.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/kenujulobotijakajanal.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814ccf731af---16117884245.pdfIn PDF document text
    • http://carszana.com/image/upload/File/rexobolexu.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/gilurilebebesiluzi.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/xuwupivubifunimuduru.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ac3391377a5f7fca3bd7b0b13fdec142/12205118461.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/periruwegodegutixugoge.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/zobowikixulugowifulizor.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/zomonitudaw.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9774e08ffd---34253211564.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/31175838762.pdfIn PDF document text
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/87297739511.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/68b0a78ede7ee72606ac5ffc23ebc094/dononopagaforupukotawewen.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/mebenesetuvibob.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/64663372574.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e725215215---wuwigoxezageba.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/73778804384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=onenote+export+to+pdf+failsPDF 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_off000108bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BB 18852 bytes
SHA-256: dd1a0bb5f7c293a1aee81dd834106b4f6ea39f0a6a933f57574a0d96f6a702e8
font_01_sfnt_off00013a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15295 10620 bytes
SHA-256: 211451ddb388bab5fb5c2cee368b31a65c800c8f3743dd874c62f385c9bfafa4

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