Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4d515fe6b53333…

MALICIOUS

PDF

80.8 KB Created: 2021-09-11 05:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 940fb96f65cfa76f517810f1b08505a9 SHA-1: 37b10480ec99c3688d41396e192911fa8e8b7508 SHA-256: 7c4d515fe6b533330b1743c0b13fe9d5cac7902b589dab789a81a32d27d7f2f9
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to lead users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://hmondo.com/userData/board/file/xovep.pdf In PDF document text
    • http://ekorepetycje.eu/Upload/file/77897666854.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc91e08c93---43817390811.pdfIn PDF document text
    • http://state-lithium.com/upload/files/zokuleged.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/49115512676.pdfIn PDF document text
    • https://areicon.com/images/file/16992963173.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/bapovufaniti.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/fevofut.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/sunududenokanajaxa.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/10105583915.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/bufigoverosotalozubepaki.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/dcad4dcf297961df2013da351c9162b1/96356591144.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/98303313273.pdfIn PDF document text
    • http://tabletopad.com/images/file/pakuvipipi.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/1129265716.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/kosibapov.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134901f5a00b---nagevopobejeruto.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/91448622970.pdfIn PDF document text
    • http://fnathservices.com/upload/file/66192328224.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/67148447299.pdfIn PDF document text
    • http://simoncaulkin.com/images/29041363080.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/05662decb6aebab98d7f86b313a947a1/63980252913.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1148590f05ea11e2d7bdb4fc8d727c4b/76174007701.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/81198238981.pdfIn PDF document text
    • http://newmob.it/userfiles/files/10971322708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=mobile+hotspot+not+showing+on+laptopPDF 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_off0000d6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CB 18056 bytes
SHA-256: 2d6ee6f1f2f4af5a6b391b57f59c2b97ca62697d0bb20eb8f66c97fd163c1580
font_01_sfnt_off0001055b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D72 10652 bytes
SHA-256: bce54b9463fa8727a03d8279654b72507bc0a9163af14061c0ee2b4cf55e89da