Malicious PDF — malware analysis report

Static analysis result for SHA-256 381db6570bae19b1…

MALICIOUS

PDF

85.0 KB Created: 2021-09-12 09:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e34a2076c42aea231e1d91c4c8243d02 SHA-1: ca3f8437af7a8677e6c229ecf1842cc72eeb9be9 SHA-256: 381db6570bae19b18332ab9d22358fad90fef6c22fbd78c20c28793a4bf2bcab
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, indicating a high likelihood of malicious intent. The file contains a link farm pointing to compromised websites, likely intended to trick users into downloading further malware or engaging in phishing activities. The presence of external URIs and link farms on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://coretry.ru/uplcv?utm_term=download+pokemon+black+and+white+apk PDF link annotation
    • http://toeicspeaking.net/_UploadFile/Images/file/sapomafamazetiniz.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/xogisixumuxatil.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/29245537624.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/98644119940.pdfIn PDF document text
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/kofuwaxim.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/49299602564.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/99043995082.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138b653cb280---62969849104.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c01fe3bd3---wazavazurex.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/naxebijiw.pdfIn PDF document text
    • http://evola.it/userfiles/files/bitaxobo.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/38124116612.pdfIn PDF document text
    • http://eternoohydro.com/d/files/sekuvevidukadonipusi.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/numujon.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/biribadixikunivupebunofe.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec0027a4ec---sulinasoju.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ff9c3405c02757416e86e36711e7809/97664236172.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/65531770940.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/64647703971.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/69462354242.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/21064419125.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/86405093381.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_off0000e11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11A 10832 bytes
SHA-256: 59b37b8f57e39bcbc10db34139390fc4beef979cfbf077c457850606deda2562
font_01_sfnt_off0000f9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BF 20316 bytes
SHA-256: b2d053a6e817d9e2c32e72fbeed22c2c3497f40ea729d6ee5dc0187ae008a74b