Malicious PDF — malware analysis report

Static analysis result for SHA-256 77361b9609f79708…

MALICIOUS

PDF

73.1 KB Created: 2021-09-06 03:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 258f5913add10a5bb3a8cf1053abad57 SHA-1: fce888effc3eb377b66b8dc1f6ad393428cecf42 SHA-256: 77361b9609f79708f815e345286e8ef8e93e50c0a6f94a3169afb24b3d108705
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, some hosted on compromised WordPress sites. The document body is heavily obfuscated and unreadable, suggesting it is designed to conceal its malicious intent rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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 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://crysiq.ru/uplcv?utm_term=peddinghaus+anglemaster+623+manual PDF link annotation
    • https://ekransamara.ru/files/xarekepofavawema.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f12fe122e---vudenaravusuk.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20216302414086.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210824230700.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/43474919116.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/94211109114.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f39054d5f---tajixokudifurexajiroper.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/85c767b070ef5762557b13103d5595d3/40240180453.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a31432ec84---77198865889.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/92e46a60d6225ae894048d16f6f0f685/14168049834.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/fasirugi.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021081501515713.pdfIn PDF document text
    • http://business-baltic.com/myfiles/dok/84548268889.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/10278155696102dc633305d.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/8b4401edc6b01b6a88ce62c71448b964/37513102266.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/jfmhpp5jt1vimjs7mhu4msabqo/2709634978.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/dubuvogufopasol.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadb8a4c7d---jurexujokelufirodosavu.pdfIn PDF document text
    • http://web68s.com/upload/files/42544737187.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/wogezibozagazo.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/8fee8e1bb2f08c99b1eb077f55676978/19195687105.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/78315685253.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf27ad4a30---jigexopapopuzamurigufadov.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB822 11136 bytes
SHA-256: f1123d0aa833fb6e824e65420db60e828ca14ffb74577eeaefd02e8737e51ebc
font_01_sfnt_off0000d1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C7 17816 bytes
SHA-256: 0a9b3579819489400b84a9b837218dfc9a5efe76d2a7ca5eca006e303116d729
font_02_sfnt_off0000ff0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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