Malicious PDF — malware analysis report

Static analysis result for SHA-256 69dd161b3e8b1825…

MALICIOUS

PDF

72.8 KB Created: 2021-06-30 10:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 348a81d7af586f292e216283025a113c SHA-1: 0fd66ad1590efafcdd87f660a17fd81c7c31932a SHA-256: 69dd161b3e8b1825c008685bbeac1f10698761143879fe3cea3714d11d2e176f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan-like behavior. It functions as a link farm, with many embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://pspectr.ru/userfiles/file/74471371579.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/50ace6f664503543bbe1aea4d3963b5a/puxexibumatagage.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/umtqjo858f9v2vkkqbp0ff500g/47566289133.pdf
    • http://se-ty.ru/uploads/userfiles/file/kajatojolopinimegarukud.pdf
    • http://cuacuonanbinh.com/userfiles/file/60025768113.pdf
    • http://coffee33.ru/archive/file/32069941100.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/1f2b5d4fbdadae0a71fe3da6ca0b8efa/mexugoxememag.pdf
    • http://apvn.info/userfiles/file/naxazasobun.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/7d5q4budrjeagaaaakdvd9ca06/mojizewemejopasewivisuw.pdf
    • http://jfe.hk/userfiles/62784847771.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/435d95fab36fddf959cb4904348818c6/felufafulaxupere.pdf
    • https://asset-books.com/userfiles/file/tagelix.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bb27dc8ca67---bipupo.pdf
    • http://snotlicker.com/clients/10243/File/11018186267.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/4770c3a512510c9b5db359d64b32f012/gudofokixakisija.pdf
    • http://shuswapladystriders.ca/userfiles/file/39348879527.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca3f552dce---puwiganelevetesagezajegaw.pdf
    • http://asfalon.com/__files/file/3879725558.pdf
    • https://fibaquitaine.fr/cebatrama/userfiles/files/lefelopisuvigojudinewu.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/s1pcip1o24ov00mndd83uailm7/sesofozapoxotulalififof.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/vabutodikijegekoj.pdf
    • http://igabana.com/upfolder/e/files/20210610124443.pdf
    • http://mdc.ir/ckfinder/userfiles/files/20856990203.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=video+game+aim+trainer
    • 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_off0000bcf6.bin
5a6424ff82118a5e31999f6c58a39f5256a5121507f139895caf25ffd61ad19b
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF6 10344 bytes
font_01_sfnt_off0000d413.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD413 16792 bytes
font_02_sfnt_off0000ec25.bin
b3186e7c3ea55377f7e73b3b2d0f877ef2d0f3aa6f27126998adcff11d018d97
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC25 16256 bytes