Malicious PDF — malware analysis report

Static analysis result for SHA-256 165fe3c7aeb0cfd0…

MALICIOUS

PDF

76.6 KB Created: 2021-09-12 08:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bbdba736e227fb33f931fc12dd179ff9 SHA-1: 9e7d29ef5bb2c44c3491276e4828ed2459e70043 SHA-256: 165fe3c7aeb0cfd08419f738c4a28f14f431fe4bcec76a1657417964c6e5338d
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content or for SEO abuse. The presence of 'utm_term=instant+free+instagram+followers+trial' in one URL indicates a potential lure for social media-related scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://silverbirdmarketing.com/pages/images/file/589843453.pdf In PDF document text
    • http://vikingpaint.com/user_file/file/pafola.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/3987142859.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaf719c9e4---32809678874.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/fudaxijotisasesog.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109032022446626.pdfIn PDF document text
    • http://carszana.com/image/upload/File/ruxaliguwowivufotesasolow.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/zaruvazem.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/17510160815.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/19620689345.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/wukanobamujemovojis.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/87840567626.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/36330401846.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c3bfd08c4---tukoteviwanaburibez.pdfIn PDF document text
    • https://electroagro.es/pub/files/4692946440.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/jevedasip.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091006181073499.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/82816061788.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/surejujibaleweg.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/43341630647.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132226fe529f---xadakiwuvavaxezoviza.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/tozizazatarek.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/40186257455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=instant+free+instagram+followers+trialPDF 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_off0000c450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC450 18436 bytes
SHA-256: c6a87c411d73e746b51ff6ae2df1dc96e19831faf4d5c88d6c3aa6a66468623d
font_01_sfnt_off0000f42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C42 10596 bytes
SHA-256: fb126f6bb5bf89f543f3b5b950fafce5882a0337f192b8263e5cf25096f56af2

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