Malicious PDF — malware analysis report

Static analysis result for SHA-256 54934311c063fa0d…

MALICIOUS

PDF

84.0 KB Created: 2021-09-13 01:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e35b2c50a943f531a40bc6c0a68575eb SHA-1: 80038f06175aaf936a76a2ba5123b019173178cb SHA-256: 54934311c063fa0da949eaa595316632288a91c5445afb998986079ce9a1a5a0
176 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a QR-code lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://hizirferforje.com/admin/fckeditor/editor/images/file/76625691822.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b34649b5e3---sitida.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16139d315efa5f---befadugovuduzatejexuwepa.pdfIn PDF document text
    • https://rinducm1.com/contents/files/zajabof.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/90514240935.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/14073999012.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/60576090231.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/kezoroponireruzab.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/13410719242.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/34469921.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/28004426565.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/64779899671.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///guluwakesunudibaz.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/3002f9b0428736c4682ed2f52283816d/wuxafilijidok.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/38243087051.pdfIn PDF document text
    • http://coumert.com/images/file/6315027391.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/jorusimezodizutegukagul.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/felenujogodopati.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/77878742283.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/67330012942.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210910_81B6EDB8C1CC6EBE.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/gesapagejogadizawukin.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/javapax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=putlockers+new+websitePDF 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_off0000df49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF49 10480 bytes
SHA-256: e65ecf1557e3ac8368761efc83ca47b81917f286ab7f4841c61996e398975985
font_01_sfnt_off0000f75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75A 19612 bytes
SHA-256: 82e2de136feb2b0ea33815cbce62ade077bb5c68feca4678848d2f4c01ba68c2
font_02_sfnt_off00012aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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