Malicious PDF — malware analysis report

Static analysis result for SHA-256 f760f34ab918da73…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 05:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c89aa87271ed02d588d3b94a0a4e0461 SHA-1: 8494dbc79b212e6ff70f11947cdb5f5fe8005a39 SHA-256: f760f34ab918da7319651c355a936f328d79828fffdfdab030057be935736588
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. The document functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised or disposable domains. The presence of 'utm_term_redirector=True' suggests an attempt to manipulate search engine rankings or track user clicks, further indicating a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ecolservizinettuno.com/userfiles/files/migifedozutewevis.pdf In PDF document text
    • https://nucamsa.es/userfiles/files/xemafozerafi.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/pajerume.pdfIn PDF document text
    • http://riph.pl/userfiles/file/parepotigefeker.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/53379025246.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3c4f95c5c---63190118408.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/pexokugosegisexuvino.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b0560d681---55809825208.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/58477951594.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129bb81ed2c9---71175848431.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/ribigodare.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/aci203u76keu7edt9ggqes6vkp/lepewovobosaribenigopi.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fdcb7f277---muverizagufej.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/c6899b1192b9f7d46b81134ca923289f/tetib.pdfIn PDF document text
    • http://yuha.be/_files/file/58113682794.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096364b7ee4a---63891374263.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/71526824953.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/burimusibuxev.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/93695820898.pdfIn PDF document text
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/63517805914.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/79881758531.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d20c64a28b0d2621ebdb6a9aed9daa53/dezazuwofatasanizuwus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=slang+meaning+of+savagePDF 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_off0000d8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BA 19100 bytes
SHA-256: e834cef27e1797a54cb33b94f6d9bf45f98a1a7f42df380f945ec7af4f2c1df3
font_02_sfnt_off000121e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E0 10500 bytes
SHA-256: 10c9123e6f1bf15d7b5e1d081ed7ed5631da66f16aaedb29d31ef710fac42356

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