Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de35655b1f64294…

MALICIOUS

PDF

68.0 KB Created: 2021-09-05 19:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6d2d538a644456a792e57022a15613b9 SHA-1: af40dbd8716d7dc572c2c1f2443be21b6d758f8f SHA-256: 4de35655b1f64294968d1a8a5521a9caaaed1d39f4730a69f7efff3fb87f6a19
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing lure. The heuristics indicate it's an image-only document designed to trick users into clicking embedded links, which are numerous and point to various compromised CMS upload locations. The document's structure and the presence of multiple external URIs suggest it's part of a link farm aimed at distributing malicious content or conducting phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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=introduction+to+biological+molecules+pdf PDF link annotation
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/o0tnj1qh242jj9upqkbribe3kb/pifakunukurafapego.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/1859170162.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/levonejokew.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/rodavaxa.pdfIn PDF document text
    • http://rc-modeller.se/images/file///36297306758.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/gurapawivanajulovofabe.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/695cec862648e1a29d0060c1bcd5c0f1/vijaki.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607938d4d01e0---92039791411.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/agtaa7q5k8kusia8ukui9ufouc/79104529064.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/88464053331.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/vesomewema.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/26865284129.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/90803655012.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760256b1f33---96890197070.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49ad7512c7---55061084303.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/0e2157cf932542a234cce543f4ac7b70/jagusewemofuruw.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/53430920439.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/65451244795.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608772e6d050e---bizozukexuxetosexibaj.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f1b060cc64b---figifirodisiforesodu.pdfIn PDF document text
    • http://fairmonteast1969.com/clients/876766/File/pogotixorowuzaw.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/texokulebebagid.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_off0000af07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF07 11156 bytes
SHA-256: 1ff7890129bcb701b0e9556c8276974580e514226cf2dbecb30b608c64839983
font_01_sfnt_off0000c8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A7 13824 bytes
SHA-256: 92013cc562d19aafc8d9b9c887f37184858a29b575aae0f6d7e394da9ed84813
font_02_sfnt_off0000ea71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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