Malicious PDF — malware analysis report

Static analysis result for SHA-256 53168b82893ac269…

MALICIOUS

PDF

84.1 KB Created: 2021-07-04 13:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f642f07c58d1ad44c24ff28c9931c712 SHA-1: f078d08260334bda678180b1694b5a6e3cdf8dfa SHA-256: 53168b82893ac2698816ff40206a15d5b599fc986d4ae27b9cf7e79203763312
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution lures, often initiated via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://amdind.com/userfiles/file/bosulenodifiwuvazaro.pdf
    • http://guides2alpes.fr/uploads/file/66508318203.pdf
    • https://beatmuellerfoto.ch/userfiles/files/83673938173.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/28c193b5a9ec02ff180d835e7cf6c230/rojozuwapomubete.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/380530be1e2b263c65718e357ce82e23/77716208370.pdf
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/limirenenuxolunafakune.pdf
    • http://lezeckastenakosice.sk/upload/files/44837680414.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160797b5b68e5e---detimemosapap.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/l5qvefuc15f34bm8pkjstptp75/76676137190.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609baa560b834---8350280172.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c4c4290b7---lojisile.pdf
    • http://akademibt.com/resimler/files/44487390505.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/287f4f752e0dd350a5617cc7be67f9ca/52516145012.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/q0loqerkg67uk2mrd81erk4fp2/wudag.pdf
    • http://beamstraffic.ae/amb/userfiles/file/76181409423.pdf
    • http://ylgems.com/file_media/file_image/file/97363101935.pdf
    • http://humanlitech.com/files/files/77558503535.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608178ca31c70---rogifagoroburisofezu.pdf
    • http://anhbanglaw.com/userfiles/file/goniregodexiwodugenedanab.pdf
    • https://rumusjitu.com/contents//files/bewidiseluti.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/kehjb1siat0facgo8q7kv059m2/xiwaxakubakejakubu.pdf
    • https://dbjadow.pl/attachments/file/66138748071.pdf
    • https://hmanagement.net/userfiles/file/puvexozolejutokefivag.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=warpath+android+cheat+codes
    • 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_off0000e515.bin
29cfc66850c52e9242f45d1202c6bd109653b509408c590c68cb5d21fa95fa27
pdf-font-stream PDF embedded font (sfnt) at offset 0xE515 17600 bytes
font_01_sfnt_off00011319.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11319 16792 bytes
font_02_sfnt_off00012b30.bin
e0adb380808f7a51f1d022109e57b011b29dd8585d421a140176cb60d1788d2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B30 10556 bytes