Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad97edf8c4c534c4…

MALICIOUS

PDF

82.8 KB Created: 2021-09-08 06:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a202917a4bbe4b942511e6db1498042e SHA-1: 0d0f6fcd6ab6c80b517f08077208811c841b78bf SHA-256: ad97edf8c4c534c45f72bae96c8bd8ffc72eac0f3f2ca72a20da834965f87342
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the nature of the links and the PDF format itself often leverage embedded JavaScript for malicious redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e69296ce5---dovajagupadakuve.pdf In PDF document text
    • http://sipzip.com/userfiles/file/92247879373.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/dufid.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/xajixetagegalolorosuniz.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/28d90b9fcb6c176a46a086c58d5d4c13/dulojopuvijizaz.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/mfmgl96vismfuotf4plrefrob3/bagozubo.pdfIn PDF document text
    • http://arablift.net/userfiles/file/safovavejoxo.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/8972521422.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb99f47483---39929467857.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/8f84673e7c1bbee6f1d868c15c0fb691/lixaropu.pdfIn PDF document text
    • https://davaocarrental.com/images/file/36728458057.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/zalilafilivodimitivole.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/58a2a05b70d606893dcd3d1bba671219/56988248896.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/12150aafac6a8e60dfc2eb9c7d9ced93/71637127329.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/wusotutagagopi.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/26019638456.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/15950224889.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/82125025314.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/41095475766.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a5da66598---79229333725.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/83491375358.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/72601847612.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/3e417e88e85025fba195437f39a449ab/tajedozij.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021080306305369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=tutorial+gimp+2.10+8+pdfPDF 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_off0000db7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7F 11068 bytes
SHA-256: ec57904106e0491e27e2c029845102c3cdfad93a7ed6fc54d1224de5a2b08ba4
font_01_sfnt_off0000f526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF526 18304 bytes
SHA-256: 4ebc21088f907831f143479be82ee74e2d6fc66ef25b8a817e8d97a2c36b4f99
font_02_sfnt_off0001251e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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