Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fddf44f0cf3fabf…

MALICIOUS

PDF

73.5 KB Created: 2021-10-06 17:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6f06c4aad4f5fa047601f12fa26dd040 SHA-1: eaa7af51001474bdf85d33125cbb95a5cf99e886 SHA-256: 4fddf44f0cf3fabfa6ebc31cc6eb83375c4ab06cf88aae1f8b5b892b82a8772d
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, characteristic of a link farm designed to distribute malicious content or phish users. The presence of multiple distinct hosts and a high number of links suggests an attempt to obscure the ultimate destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://labotinnghia.com/img/files/gerapokedom.pdf In PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/kutomuxogodosemetemitorur.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/befajitememadagejo.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/biviruwib.pdfIn PDF document text
    • http://gamulchi.org/userfiles/file/83168432816.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/tekinodezegixeb.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/68343584578.pdfIn PDF document text
    • http://woykoff.hu/upload/file/winabifilosuparitu.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3e6cd42e8---45790413977.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/pibesilezalizaxesokonaf.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/96601691314.pdfIn PDF document text
    • https://eternalbliss.net/file/kuronuxa.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/55317918845.pdfIn PDF document text
    • http://korytnica.net/data/files/dubavanag.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/repebadijezabatufenuj.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/fa45b919d19672c05929a09b4ced0164/molakefob.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8399c5d4d---27581073971.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/kumute.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/47570035078.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/jikevuniretutusavataxi.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/95388447013.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/53438312548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=movie+characters+with+red+hairPDF 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_off0000bce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FB 17072 bytes
SHA-256: 484e90befcc4b831aa6f0d087acee7547489a006d835c0008ce3909221902a5d
font_02_sfnt_off00010084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10084 10460 bytes
SHA-256: ac161cfefe864d8b0477ec90296a9890c72e66e61d043d6a945788e45079833b