Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a04456a6daf613…

MALICIOUS

PDF

74.9 KB Created: 2021-07-02 02:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 16449fe67d5a22f376920ff4de3df40d SHA-1: 561ab12f87c42489ee8906a07b71635218f1673e SHA-256: f2a04456a6daf613c29e5d7ac7cea8a074d51a9e79ec5e5adc12098fee67e140
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs hosted on various domains, many of which appear to be compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using disposable hosting and compromised CMS uploads to host or link to content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=modeling+workshop+project+2003+answers PDF link annotation
    • https://apoiotelecom.com/imagens/img_fckeditor/file/32768631632.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/08934f5fa2710f9606cd37f9c80cacc5/22164236318.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/102d853e706931fa268a98f33cb62bc9/73873241561.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/vpuk4lovvhg28b5ifc2d8ftedh/96865617752.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/d8p1vr6756o3605q4blvntgsot/kenavexejiwemenirafu.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/p4ec0kadbtkfippuopc7hg1uic/deruvanopuporajubamoxuku.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/boluvosokubowalofidus.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cde6c1bcdae---zubewozulowekuge.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/tesosaxotujigajow.pdfIn PDF document text
    • http://viewcs.com/partner/upload/dextfile/zufakupelusezajofe.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/obv7f24cgno8viqc5s6tv23kok/xelaxexizarikopix.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608532226e206---weravogoxinogasodirava.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/gusazoguru.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084228dcdffc---belejipeko.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba0ac27363---30446987141.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/77756912046.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/3a48a869fdd43992a69b9dd11e5cfa53/todumorepi.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/nigosi.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/f9a939d33c705befd069680dae73d718/mimunaz.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e4c985c25---jaxuzunewowomo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607110da8cc66---32689533340.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/mowakokesofegitojemadijuj.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/91740334247.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/8uks9pkc0pkrms2fnkjgm2iu48/51080886128.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/wevofuko.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_off0000bfd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD4 16600 bytes
SHA-256: 54ba65bd3f6ea580e448118859af6d4f9e10168cd508f831eba92c2430d455e1
font_01_sfnt_off0000eace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E5 11508 bytes
SHA-256: 47b13f8bd755ec829ddcb9f648b09f65d36efab576347dc8aac14cc9df44c7f8