Malicious PDF — malware analysis report

Static analysis result for SHA-256 41cb49ecfe5e0db3…

MALICIOUS

PDF

85.1 KB Created: 2021-08-06 14:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 891ff8bc7e58b68d0f3da43a6551686a SHA-1: f62563a407bc79611b4ea39e104b9b70eb18437f SHA-256: 41cb49ecfe5e0db309f32c0caff95c9bcf85068b372763e8b5851fafb2f29e99
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the document structure and URL patterns strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://locthanhwindow.com/img_duhoc/files/49970990306.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7b805d2ff---lejivosudunosuxodo.pdf
    • https://warsztatgdynia.pl/app/webroot/media/files/39155586165.pdf
    • https://foodphotoshop.com/userfiles/files/83710623252.pdf
    • http://atdawnwelift.com/userfiles/file/gananadawokox.pdf
    • http://taskentcompany.com/userfiles/file/wufowufubenuxazetexa.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/q208avj51f47dr091odr5aluta/21699313392.pdf
    • http://kowel.com/ckfinder/userfiles/files/1623975456.pdf
    • https://mundolibre.cl/uploads/userfiles/files/gokigijojisexiwaropuwu.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/9c673683ead63b64134582fd1161b121/39919752952.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/9492ae55cad02b148a18877a88d1830d/revumoregewubepagopipim.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/5dc6f7946186ecc96fb4c5ba0a58766f/43747721114.pdf
    • http://akinmedikal.com/uploads/file/95435280947.pdf
    • http://haohanlegend.com/Uploadfiles/files/47101784861.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ff22f7ddc38489a79d4100425bde9cd2/48668423212.pdf
    • https://ezastupitelstvo.sk/editor_uploads/system/files/zevipuwemasanejumi.pdf
    • http://tatvideo.ru/ckfinder/userfiles/files/70611952513.pdf
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/49967072089.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/6ret9d6mu2f2kjmdhs9vad8ua5/xobuxabiladajorika.pdf
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/robunodiwipawizinozeb.pdf
    • http://fixafilm.se/userfiles/file/funuduxagazufog.pdf
    • http://aqbnb.com/uploadfile/file/38313050856.pdf
    • http://jnnycc.org/userfiles/file/vikowuzen.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=why+shouldn%27t+catcher+in+the+rye+be+banned
    • 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_off0000ea17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA17 16792 bytes
font_01_sfnt_off0001022e.bin
84c83dfa01a223a2445f0bf94ac03122aeaa2fb769e02f0cf6407a5cac205180
pdf-font-stream PDF embedded font (sfnt) at offset 0x1022E 10848 bytes
font_02_sfnt_off00011b3c.bin
aa1cac6d0b7b75c7fa840fbc465f20be1b44497b341e38e8a1b56777e233ec71
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3C 16800 bytes