Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a516ecf5f02504d…

MALICIOUS

PDF

93.8 KB Created: 2021-06-26 13:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 445bc226c749e93cf83a95021798033b SHA-1: 09c8ebc1068b6dcd9e78b3d10fd666704f39d9de SHA-256: 9a516ecf5f02504d0c5511405919993a3b3b174976c357c97d435e99c894da56
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself is not directly indicative of a specific attack, but the external links are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://csodamalom.hu/files/files/45271693234.pdf In PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a4e8e2473b2b2846e1ada24114b707e/61805392196.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/7ucc1n8i7r93cemc2h56acfcn2/96842185323.pdfIn PDF document text
    • http://abpaluso.com/upload/file/66758966794.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/zasewixokomewulixegilad.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/65973422121.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/96899656018.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082c19b274b4---soliruf.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6c6261a94---lagagixizoxubanarevuseva.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/tqf5r8n2db7hjt0u9r7m89252h/89940108694.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/blceuufbke64mfh2luq6qdb981/31433325669.pdfIn PDF document text
    • http://ivaco.it/file/76198693465.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/d4866137f70354a824ab53e93b31f4df/16218179230.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/dde1d44b6d4bdc15cf147cd5a0f705e9/82196588715.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b38ee1b00---rukam.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3745413f4---32245859870.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607750355eab1---63845589624.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/0jgpbstg98d63mg4a0ujdp12vh/rovud.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/wakafeweno.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/14fg8lmb2i7o2crubd603ae9e6/lenali.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b40a4a31eb2---94681855058.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/muvulit.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///rabisudoxufokemuvunug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=teacup+chihuahua+full+grown+sizePDF 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_off000106dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF3 10868 bytes
SHA-256: 23f2cf055f160c5946d01874b3ad0c8c801b256555927682b50234c833f0bb66
font_02_sfnt_off00013811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13811 19304 bytes
SHA-256: e29eb1b1ba4ac16846e7f267adb33f74a4807f05e2527d0cde1c0e4fd28a65c2

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