Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0e91123387e905…

MALICIOUS

PDF

85.4 KB Created: 2021-09-06 21:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 216fc1ca6e9272117c49da22ef43b343 SHA-1: 6104e3f4ad5209f78292efc77e5a54e12970205d SHA-256: dc0e91123387e9050bf1a0216dfa0bd9fecc26bb31afd9532c3decf7e72d2a26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. Heuristics indicate a 'PDF link farm' and a 'compromised CMS upload link', strongly suggesting malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://compufoxmail.com/userfiles/file/vonobuzunemorimavur.pdf In PDF document text
    • https://haciendaloscipreses.cl/upload/file/15869337720.pdfIn PDF document text
    • https://ms01bet.net/contents/files/34346097656.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094b0f6c5dd7---39216580699.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86012452802.pdfIn PDF document text
    • http://rococosofa.com/files/files/56629539300.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/zidegijeli.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c82b1832b---lilimunarotob.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/tikulunojafegogusikakab.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c82ef24996---pipotezebitajowaxepebiruv.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/gavejij.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/25156835895.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/ridilesadoxexerizeposev.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/1734cb828675a8ced90f205bb3e7e86a/setitinafame.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/varusirorobane.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/88645082666.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779072b8cf1---900143378.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/45158804932.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/73374899257.pdfIn PDF document text
    • https://landi-bg.com/images/file/57537043103.pdfIn PDF document text
    • http://thehonourride.com/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/moxobilitazikuwoga.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/lovofe.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/fowosarabotuwugoxifaror.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pasonomi+bluetooth+earbuds+user+manualPDF 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_off0000e73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73B 10752 bytes
SHA-256: 84939a6a746c3a1c7f9c23e24e037eaab55d324bd27b570b32cc23513a967180
font_01_sfnt_off0000ffb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB7 18752 bytes
SHA-256: cf68e5514d1a88ffa0eea02e5bc3dc0673ee221ad5b45656ba5bb3b89cd2ec3c
font_02_sfnt_off00013052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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