Malicious PDF — malware analysis report

Static analysis result for SHA-256 405099711df73334…

MALICIOUS

PDF

93.8 KB Created: 2021-09-05 07:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b28b29081989b7cb907d76adc3e1aac0 SHA-1: 4d67584a993c9e5833bdc8b8bede58eb82d8a7fe SHA-256: 405099711df733342bbb2f4546ac1d105c2b6475c07a8eabf6711306903f576d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160985e5c05fdc---sebuterase.pdf In PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/voxodobeminilugenik.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/71848688297.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/gozerijerakedumafoduz.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161007f28e5035---lubebikefumewatawimejofe.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/mezesuvufavegalixokiworod.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ds2thq0751gl3kcjmoh2o8o47o/kefelovupenajoxem.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/18909485708.pdfIn PDF document text
    • http://hevolta.com/upload/file/ruwizevog.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d79cad3eb---41036520751.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/rinopuzodulose.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/bigobuvepigabizosu.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/vakezuselojinofokepitad.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210804_082024.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/33341296165.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/68637825372.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/b28777e50d9a565f045cf69062f18173/65779291612.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/63821634982.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b3375ac97e912ab5df765f20f6897dfa/jerof.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/01/file/44188918512.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160767d7f3cfcb---47613869480.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7d4cgo76tojj6g2ucojcj00nh1/8341879272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+create+a+website+using+wordpress+pdfPDF link annotation
    • 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_off0001086f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 11064 bytes
SHA-256: 52162b608ae6591ef8d0f9d3d21a44549059ff163d99328e0b295e9f58ec1bc0
font_02_sfnt_off00013a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A03 18420 bytes
SHA-256: 6b341155269bc197d7623a644832260a697f30387b478ba0b3d189b79543e1e1

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