Malicious PDF — malware analysis report

Static analysis result for SHA-256 157cf110596684f5…

MALICIOUS

PDF

72.3 KB Created: 2021-09-20 08:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f9690ed05d9a7b3526dfae11bff8351d SHA-1: 5569f3d8bbfd04a5025090c4f03c8a33526b2a0e SHA-256: 157cf110596684f547556e49605ebcdcfada5c25e02a3d5264dd45bddd6fcf0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing pages. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=cashback+torrent+magnet PDF link annotation
    • https://mokhalasati.com/userfiles/files/21412135949.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/3223164593.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/sotarijilenopuduripijuru.pdfIn PDF document text
    • http://www.celso.org/download/39346356291.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16131da3e869ce---jawujutivonapanefogaj.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300a36d686c---82436139687.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/lofabezopebus.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/15/35888206189.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/91990008948.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/redumovidokozetevuji.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/merodog.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/d108c002bd79c33f8b1b0b8acff55889/tudamenugadisawekewo.pdfIn PDF document text
    • https://agregadoschucuri.sinecsas.com/ckfinder/userfiles/files/48196196660.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9638b4b3a62eb099f7abb1a9501eceac/bigetifigigukutasixobixo.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/tefevutu.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/63228621782.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141e16c04e36---85791115781.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/31355418201.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/46754863499.pdfIn PDF document text
    • https://proxus.nl/file/39621154732.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ac7r6rul5kth7er3meqg9qfu51/43921766843.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/tikadekilobe.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c35e101fc0---jupuza.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_off0000b821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB821 16548 bytes
SHA-256: 5fee2851723eedd4a30823ceeaff072747db9c526b0667dfa1dc647ba969a409
font_01_sfnt_off0000e2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFE 10804 bytes
SHA-256: af7844e001a47aa77b95c0112382b3e1a003fc9815334f017895274f1cdff7c1

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