Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d6ad8fb3bcd044…

MALICIOUS

PDF

81.6 KB Created: 2021-07-14 10:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7e15e8d6ee8100a9ce5c6488acacf49 SHA-1: b4bc5f5aca0523985c04c75ee3e3e5024956144a SHA-256: b5d6ad8fb3bcd0446e995aa1d1b021df151ba02a9ed420eecb94cf29efe48845
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to lure users into phishing or downloading further malware. The presence of embedded URLs and the nature of the heuristic firings strongly suggest a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://laborke.ru/uplcv?utm_term=reticulocytosis+usually+indicates
    • https://ludifrance.fr/userfiles/file/kewubalilej.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6ed6c0b0c---fidodusikusupevev.pdf
    • https://tort-art.ru/userfiles/file/17619872473.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/tofovufuridufifeno.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/acec75dbc7fef66f2db47d22ec4f7851/33263241074.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/529abd464100d03dcc691ecf8ec8ab05/rateletunafulegitef.pdf
    • https://tbsva.org/Upload/files/20210708215356.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/90305023534.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607032a1f19f2---besisoga.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/2a572a9c550109e5c0f87a296c178a60/88768149066.pdf
    • http://hongshengfish.com/uploadfiles/20210608/2106081021323542244mme6uijcg59.pdf
    • http://tks-forever.com/upload/2021/07/10/file/jibopoz.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/r4ioekvhsmdsj2q4pt1snmpusc/35517031522.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a2734a172---41226781955.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cec8208b6e---wakirotelavuwalako.pdf
    • https://tmtteks.com/files/voxelagek.pdf
    • http://thuduchouse.vn/pics/file/68093421625.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd82.bin
8eb0bb6166356d12ff066e3e1e986bf5b982f3b04b545c7e69ff3a8c84d2d4d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD82 10520 bytes
font_01_sfnt_off0000f5a6.bin
cb83cf9ce77a33cf314a9a4497e11f7d1a9b0eed204745f9dccdb9d1ead88768		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A6 16820 bytes
font_02_sfnt_off00012170.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12170 16792 bytes

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