Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb071b40ed3be033…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 21:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26760a8b933fd39bb29eb34c266e690e SHA-1: a8cadd28ee8a811b1327553fee13e1dfe6be6de5 SHA-256: cb071b40ed3be033912743b9543a25f3b2f18d200e450fb3b4a0ddf92dd548d4
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, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting an attempt to lure users to malicious content. The presence of embedded JavaScript, though not explicitly detailed, is a common method for initiating further malicious actions or redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pixomot.ru/uplcv?utm_term=definicion+apnea+pdf
    • http://work4shop.cz/userfiles/file/47463669679.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/27d4261e271a0a3c7a53344a12e94b49/50406288883.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/5cdb7c3146f98ab463bd6a44527f612a/fibapevuxuxekarowanibem.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074604094d63---88085934617.pdf
    • http://movitecnic.fr/ressource/site-image/files/56577445571.pdf
    • https://camphacement.vn/upload/files/fekuv.pdf
    • http://belgium-ex.com/images/blog//file/52843583844.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/7n78svnpopef80nr0h6jaquqk5/66121544653.pdf
    • http://phayaotechno.com/UserFiles/File/60747141888.pdf
    • https://hondamienbac.vn/userfiles/file/sawisupudabisakidim.pdf
    • https://amd-export.com/site/upload/file/43803064773.pdf
    • https://clubsecurite.fr/webroot/upload/files/34480449996.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085eb41af020---jowivosusoruzajosuxez.pdf
    • https://dubaimotorcycletours.com/uploaded_images/files/32220992307.pdf
    • https://commonlawhouse.in/userfiles/file/66263105082.pdf
    • http://parisplaza.net/clients/3/35/3561a7ce45da2f2f114a98ea6175a4b1/File/17416553304.pdf
    • http://viettruss.com/upload/file/1393729733.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ru4h65nl5ppd7704qf7glrungg/82686798909.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5b9c3840a---rezavosinubaxavoguvis.pdf
    • https://seikai.jp/free_images/files/39459119400.pdf
    • http://otoozevran.com/resimler/files/34436590978.pdf
    • https://llibreriaha.com/img/events/file/39117169970.pdf
    • http://umhouses.com/uploads/files/torowadav.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/gakadigowodufawafumexuro.pdf
    • http://szentimresiklos.hu/upload/file/41961004475.pdf
    • https://sibois.eu/userfiles/file/1753227343.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_off0000ddfe.bin
051e4723b11a9e99b7d2ec1e5f476f4a6c5596bb960d5824610b50f9012b8efa
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFE 17588 bytes
font_01_sfnt_off00010b06.bin
983fdd10fc6bc12dff19e658e2df7cc4ab0fb2cd7bdfd4734d86c28010906e32
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B06 10204 bytes
font_02_sfnt_off000121fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121FA 16792 bytes