Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d751d9ba96f13d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 10:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2c0b2a077ae87ef5374d77940f2c5941 SHA-1: 11f781e6c982a64fc654181f35e082add41c3b56 SHA-256: 55d751d9ba96f13dd5a1b0dd5180e8b7aee55ac66e11586c658fa557ff0a5dbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and EMBEDDED_URL heuristics further supports the attack pattern of luring users to external sites. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://philabc.ru/uplcv?utm_term=rust+book+2nd+edition+pdf PDF link annotation
    • http://lmyc.net/clients/875386/File/24580008278.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/wobavetetinunabureb.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/tl1g1sr51u2on3uk23f966721b/bovajavalafoz.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/kobexoxileraleruforebabu.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/nugolefotokifuwenekeko.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/04fdbbd881c606748c88980b581a00c9/51246083064.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/sezafukije.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff6ffcb695a---51710178992.pdfIn PDF document text
    • https://alutat.com/data/file/nerewaserozomano.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/286ef5156d4d34990b5638c4ff9b9e1c/4798761753.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/pawulogotoguwureli.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160746d9974ba4---69162625132.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/80e0622ee0bfc65a27e4b8ea6cbf8c7c/tiwukagenude.pdfIn PDF document text
    • https://noventa.cz/media/files/file/gikovaxamenexu.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210810081054.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/33641622266.pdfIn PDF document text
    • http://promador.pl/userfiles/file/kinalokoxisabera.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877f5934973---garamenusaxawegibug.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070db21287d3---supukasukonu.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e779c1f11a---11366276344.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/21074032635.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/wikiwinu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16084d25e6895e---60525535824.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/a608e5d29816f83ae6ba00104adda103/95718004928.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/b1ddd0d0a307c055931aa8a5a4fe90bb/41288119995.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210812092806.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b93785d4c3---1439871874.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF39 16820 bytes
SHA-256: 63a17244b3fb2a02a3efc6d67fb0d16c7bb95c8edd217d254145fa4bc6ec5d58
font_01_sfnt_off00010b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12328 10680 bytes
SHA-256: 3ad965868d4a32812ae3a04655e2d55994c4276e90446bc9ae0b0237e602e7b7

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