Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c91f98078457c7…

MALICIOUS

PDF

76.2 KB Created: 2021-07-16 08:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 34d1ef93fa561795b570a78a543045be SHA-1: 94dc34245ffb3d1f9b2422829d5f15f015d2e409 SHA-256: 91c91f98078457c7de94b304a3a6361febc5ec3a8f8300e1303355dc67cd5067
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609295602d6f6---72805519709.pdf In PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/4e8574e32aa066e0acb4fbbceef092bb/28305403279.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/18679654057.pdfIn PDF document text
    • https://ms01bet.net/contents//files/kupujid.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/lifuxuweruduxedo.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/73382950675.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/vivunumo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805dcb9f7b3---ruzurimebu.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bdc970a9e---kuwalupivurexejotoporatab.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/mited.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7edcb342ee---torixezurapowujusajigu.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/63616282023.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/jupapebonukok.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/71761714700.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/9eqvqlfhd7olp8b17i5tl33oc6/zidilupubazexitifigux.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/8708159697.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/09/file/mosigufirelusasejinidib.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/14733657772.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/71858723693.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/bodezisakevijurulodujo.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b6b29c9e3---gipozuwajabonodakizo.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/c4dd7e192b9f8abd46c4b679e960beec/jutolomefokapekigijatuv.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bffab29d7---68746427312.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/2a9d9f71d377b8d45ca1732c44bc86cf/romiriketenatefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=slant+height+of+a+cylinderPDF 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_off0000c56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56B 17412 bytes
SHA-256: 9ee586b4d54e63d99a4053afbd586f0e5d843ffe8d34e1a57d7ab02fb4af3e9a
font_01_sfnt_off0000f366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7D 10776 bytes
SHA-256: 5bd80e6e86ba434e4da2424a838423e87178f7645e7e5a46f299b642eb94fba3

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