Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd7510b20d6be4e…

MALICIOUS

PDF

92.5 KB Created: 2021-07-15 09:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6224ebe647183068d96eb0b7b8ae03a9 SHA-1: 4bfe642f512288ade33224f165e920a6a7486b78 SHA-256: 7fd7510b20d6be4ed358849c9dae3092ba42ac88f080f66b72ce12e11f52b27d
196 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as an advance-fee scam lure. It contains numerous links to external PDF files hosted on compromised or disposable domains, likely serving as part of a link farm to distribute the scam content. The document body was unreadable, but the heuristics strongly suggest a phishing or fraud attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://rowadalbyt.com/userfiles/files/mobivupolulolefizunilavof.pdf In PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/jn9b7o6u5s0u5aop7h4juha802/vupovasivakedabazaminig.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/pududipulot.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/46699766859.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/58530193434.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/k59scs30kiib8ff23cnhbptg08/11476700768.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160860a6500547---70124308847.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16080e434a9e84---volarazase.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/manuwutanijisowewefozed.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0ab72e8db---petiruvaredovetojajemibaw.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/lt9c9obqv6l2oca8viuog2moej/lolefawibanitonujufate.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/71398472479.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a96e001d0c8---35030517529.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/xurovakofomupipezirub.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/335594128.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/xakupaliz.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/wuzosorozulumamokek.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/jumapanopagatekego.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/rupejikejuzirozepokev.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/f54dee71b1a608c24a33e5a785d3b5f2/gakaxel.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074188cab8cd---28961167481.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/252024248846.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/diwoponat.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/24793458720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=do+small+envelopes+require+extra+postagePDF 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_off000105c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C7 11008 bytes
SHA-256: 421846d355d42e84e3cfe5276f28c42d306220a291a64b74c89aec14c03ff6a7
font_01_sfnt_off00011f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F02 17484 bytes
SHA-256: 4b0ba9418fa64382e10fc93d26575e3788a8928b1d2de91e7d8f80438a92af2e
font_02_sfnt_off00014c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1