Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b752352b392d9b…

MALICIOUS

PDF

82.0 KB Created: 2021-06-14 12:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89462ee5a0ed05a51950e2ef500cbd67 SHA-1: 14a4e5d30e42f2caa45f0e86a19da47dc3da7310 SHA-256: 77b752352b392d9b72887c4edcb72ff95a48e03d92128e1cc8e1b6e7dbc6234f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of a search term related to a common consumer issue ('Ps3 joystick not charging') further indicates a phishing or scam attempt. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://infrive.ru/uplcv?utm_term=ps3+joystick+not+charging
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/e70a54947a2e33ee427dcb22933bb561/30325765929.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/f56973a88ec51a824267a5eeb9409913/98375588895.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/42af31d7e93f703f2eff309783f65672/lekaroliburijagutulo.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1305d3ff6---48897841514.pdf
    • http://bogelaipigeon.com/upload/file/dijoxijomodozujisa.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083edf3979f7---deguv.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaab2b7257---wemerizekipoko.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90eabab52---kanitinixipexubeb.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2614248638---wiwinumebuguvobotaruv.pdf
    • http://szao-spb.ru/images/news/file/58462272115.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/a7fp664odjm7c1cqoas8tvmhfm/55338133492.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/duir0er26e01leabsqhcgspf04/18951101308.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbeb1e3d56e---gazikogisevetizojola.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/07db233afe0001444f883e9785d7f8d0/120543109.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d20bd1f267---61300475011.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609882b97cd20---mowulav.pdf
    • https://caribemed.com/userfiles/file/49429805048.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f565.bin
ed842d785f5bca13714b4e15a5c63d4e91d806891c20c4385e2126a00dc0b622
pdf-font-stream PDF embedded font (sfnt) at offset 0xF565 5104 bytes
font_01_sfnt_off000106ae.bin
54d97a0fe83611d5a75e205bfb64f0a6036f97c92b0ac49d7266d764e432fdfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x106AE 11176 bytes
font_02_sfnt_off00012c8e.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8E 4324 bytes