Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac5f7b5bf051659…

MALICIOUS

PDF

80.2 KB Created: 2021-09-15 10:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2854c4ae84e0a7b4045df2bac6adaee8 SHA-1: e1b13ee41b0fecb78322e4325373a36055396f22 SHA-256: fac5f7b5bf0516594acba37caa6a7067b0f1133670738699f605e57a71f0570d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://aven.su/userfiles/file/80979317409.pdf In PDF document text
    • https://calendarsunrooms.com/userfiles/files/dikoziwolebozatiboro.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/15d0de86043f7453f5c9c0c452e6bd2d/vuxelomewete.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/xagolumuwalu.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/56089220135.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210907_5408401D7BFBFE2F.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161329c6057713---11132267372.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/talew.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613041becbadb---moxexuluvafefomez.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/bavejibatabamaborinif.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/8609272287.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb7979bc53---kedulo.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/14777706681.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/73673809204.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/58841445461.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/38c623b99597178a3e7913f0c0536ae7/90917651903.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/gujisewasu.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/7575130804.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/zunafudusutabux.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210914151157.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210901111245.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/21823111704.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/tujigu.pdfIn PDF document text
    • http://mayjack.com/upload/files/pogag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=padmavati+telugu+movie+onlinePDF 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_off0000d59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59A 17684 bytes
SHA-256: 1c20aae84e08721a318f3b1f11484855d88bee73762b13429a3d8c548cbc1b52
font_01_sfnt_off00010366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7D 10488 bytes
SHA-256: 88be8cd6d517609cc64443c48a5036f8912e26a7b0335dfd441addc1e05c6ce5

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