Malicious PDF — malware analysis report

Static analysis result for SHA-256 abcb6b4dd59d9896…

MALICIOUS

PDF

120.6 KB Created: 2021-06-27 12:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4f096d4dd7d93aa62d012e496d77096 SHA-1: 2f88abeece7220221f3b5cbc3ae4da70e9ac45ae SHA-256: abcb6b4dd59d989626db4cb707cd1166a9ad2654564313174be430b54ab23ddf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to external sites for further compromise. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=pitch+range+of+the+highest+female+voice
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/11078h5rb41ikcpiss8s7l8k4c/kavizexupujosowusef.pdf
    • http://beloezoloto.ru/userfiles/file/tuviridexogu.pdf
    • http://royalwedding.jp/images/blog//file/2572390712.pdf
    • http://allg-gyn.ch/userfiles/file/63793484091.pdf
    • http://pantryscan.com/123cars/imagefck/file/fabox.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/00035aa7fb63d03d42744c9dda9cbc8c/91573843893.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/crk7oc46ob5ubebt8a5fa37j9k/rejidu.pdf
    • http://netinflux.net/userfiles/file/potoreladixubedumamiwozu.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39eba5a969---72482454354.pdf
    • http://nanoscopy.ru/uploads/files/soronovekepenemitegowugal.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/8ff5f44955b376d2fe2b609346d1303c/mofaguvimadexabupusi.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/57a7896bd6f2b9bb334e49a4d38eb6b1/zivazavidovosesipudov.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/kgqakrfadsf3cudgaildirs5v4/vojuxexazetevetaro.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f858272c3---47175124250.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c443ee71d42---losapuz.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/000d640c1419bb69e6df8b1bde2ba907/kipavelavobo.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/fhpspg2a2qlustk5gonbjjqqer/panatowexarogilo.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/de7e44e311a7ea25efeb5af03fa03788/referadarutiloxesegol.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776336841be---vunomul.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b804eac95f1---sovebive.pdf
    • http://agrobud.net/uploaded/file/26806959624.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/1e189234aea9d3aa47cd581bab0c4659/wesipitesos.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/1iklj6rvsq0mpilcshfkbdjgq7/pomaxizik.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609435ce3f2fb---25245895231.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae9ca19d9e---49077435600.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/005596ddb10364a47bdafd6b3fede7ba/dunokepoputozuxoxegonizib.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015f53.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15F53 16252 bytes
font_01_sfnt_off00017533.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17533 16792 bytes
font_02_sfnt_off00018d45.bin
5bcfd411ef3d246bfd4588257bd86de2368cb56a8a4323032da95968e26e8428		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18D45 17168 bytes
font_03_sfnt_off0001b9d9.bin
6ac055ca8a456e02e0bf938bdfab262e3beb2d7ce43871a9764a96e0352831ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9D9 10852 bytes

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