Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a34e77a8ab5b6e…

MALICIOUS

PDF

68.9 KB Created: 2021-09-27 22:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3dc40ef94c455b1752ef488b502ca1a4 SHA-1: 67510068bf6f07e607aa3ee1b1c099d62a34787e SHA-256: f7a34e77a8ab5b6e064c98b530db7d6c1ee4528472560f945299af62265f2b6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous URLs, many pointing to other PDFs hosted on compromised or disposable domains, suggesting a link farm for SEO manipulation or malware distribution. The presence of external URI heuristics and the compromised CMS upload link farm heuristic further support this. No scripts were extracted, but the overall structure points to a phishing or content-distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pemaboutiquehotel.com/assets/userfiles/files/58150248647.pdf In PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/xomenikokaza.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/vizogivowenizir.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/wajidejoj.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/79683768060.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161492be3aa846---39907960124.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145adc90bbc2---69593853828.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/tavur.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/48248652131.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b66ebc85e6---popejafuworerikezelupe.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/23347355674.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/kupad.pdfIn PDF document text
    • http://karikatura-kovarik.cz/files/file/vekisokipazufaj.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dd7962c9d---fonikal.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16138bce1f2651---benibobarufede.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/4052381477.pdfIn PDF document text
    • http://medius.sk/userfiles/file/fumume.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/bejutozisodifixu.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/19323745699.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/93419181780.pdfIn PDF document text
    • http://inspeq.eu/public/files/22211251142.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/61861865023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+get+the+galaxy+scout+skin+for+freePDF 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_off0000ad41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD41 15440 bytes
SHA-256: e12ba1703bc80f945d64c7f4cbc90d6579ca8cef9df6d358a6a928bb5003680e
font_01_sfnt_off0000d403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD403 11100 bytes
SHA-256: 0d7af9ec4c4812000a16237b0e49b7ce8fe2f9c9394ec266e4438a9a69b8ecf5
font_02_sfnt_off0000edf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1