Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a0932409a47b1bb…

MALICIOUS

PDF

87.6 KB Created: 2021-06-27 11:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 45d9ecf6d548102763e1f94c80c14277 SHA-1: 2bb02229781bb9b7f1adbd7aecb068e23e29dc6e SHA-256: 5a0932409a47b1bb0bb1e8c810450b2712bc01774f4263ce0b79f601a0d43f9f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farms strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://archism.ru/uplcv?utm_term=dennis+phipps+well+drilling+inc PDF link annotation
    • https://cortopolis.ar/userfiles/file/gamujajevijanuzupon.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb296d6754---mejopepobomuzofudaxu.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/k0h4595rkgt2rque944btt33vd/kepivida.pdfIn PDF document text
    • http://pronobile.de/catalog/file/59861528256.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/hhj0fk197h43s1p1113pq05n46/jufakusurugas.pdfIn PDF document text
    • https://cutandcolorparrucchieri.it/file/20381338253.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803d5db95ea---sevodulokopetivi.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/445b0ab5054c63fbfc448d6d42c79974/mopaxojipefo.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/cc61b585e8c89e39063c45d1f99bd82e/43292790607.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/6929993330.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c365daa30---kefebaruzar.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba7a4a85ba---66359819359.pdfIn PDF document text
    • http://kelvista.lt/images/files/33763825312.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16088a9814dbb9---vikafukibonibuzomijutego.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/mipininapufevevelax.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/geperozenorenokotabi.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/febeteniniwizejivumo.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/degivuxat.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/d36b70fa61a45366c27117a38d5542ee/33291411471.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/guzozijevimeporuna.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/20258858052.pdfIn PDF document text
    • https://amblamy.ee/upload/file/manut.pdfIn PDF document text
    • 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_off0000f694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF694 10500 bytes
SHA-256: 051dab290d50e22ad1608075b08142685f8d45dd77863c2f7c5cb1043aab88c4
font_01_sfnt_off00010e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2B 16508 bytes
SHA-256: c4a0c562720f46cea1cf9125e5489eb2f2501f65c51b87742452144a46696aa1
font_02_sfnt_off00013932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13932 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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