Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b107d72133548e…

MALICIOUS

PDF

103.0 KB Created: 2021-06-27 23:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7046e49bfcb17383e61645579807f50b SHA-1: 2660a47e29998ef8d5ef3951bdeb77c6bb588979 SHA-256: 56b107d72133548ea779639b6d993714c3d91b7322d8883a616af8bbc4d4c9f0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted from this sample, but the link farm structure is a common lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://nomylo.ru/uplcv?utm_term=proprioception+physical+therapy
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/gddlabhj8brr6ccetjs7m3ttbd/mevelonul.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d18847909f---jiruliror.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c105646f854---berukoni.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4974953d31---95291305447.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b45bfaf3a22---kijafosaxajisuvijeremi.pdf
    • https://kudamatsu.org/userfiles/file/fitojifopub.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/75juo42rlm77u1hrmp2uvdk8no/baresexaziradofakinuxov.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/2fd2877f5f93d405ade3195bcd3a086c/53154271964.pdf
    • https://areicon.com/images/file/wipanile.pdf
    • http://tfh-filter.hu/_user/file/wilefuzipexijawetonen.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8bf7335db---jegawoped.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b64ec7731ac18e2508c6ce0809109a7d/50018769074.pdf
    • http://nhatminhtrading.vn/app/webroot/uploads/files/gifokegivabowan.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/fucc14u6b6huqaj5onvnc047n7/fizafefajisizidunomeja.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/23ba6c91691db3f0ea45261eeb6ae8b3/97853779209.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e34080e2d---gadopebezefisamabofudok.pdf
    • https://alice-immo.com/userfiles/file/xowezunidurilites.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/c1d902bc46ec9913abfca33a48c249ed/kasamidi.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083970a4e722---lukexosakomowu.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb2de710f5---9906923600.pdf
    • https://karinbentum.nl/uploads/file/55563529795.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/d4mm4nq3rfq17htp34aa539keq/94581313818.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/cae7b17b3e1bfe3bda67e4c6da57cb65/ritakojutemol.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_off000131ce.bin
6751a53a57b56239b5fad41186cd7258815f93caef41846ad38405ba68649f61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131CE 10588 bytes
font_01_sfnt_off000149f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149F2 16792 bytes
font_02_sfnt_off00016204.bin
02e322dddcea8d0f231b61e8021ab78f29e3a034b13e4b13d6991446dcdc0f77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16204 16796 bytes

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