Malicious PDF — malware analysis report

Static analysis result for SHA-256 7352fe329bc5f4b9…

MALICIOUS

PDF

101.9 KB Created: 2021-08-05 05:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5f6113e0a5486c5dd8eb2e0ab8c436c6 SHA-1: e5f336ab295859e1c5e8f3df7a48ca89884b2b6d SHA-256: 7352fe329bc5f4b928a075e6a0313edb7a99f58fcdffce5131fbfeac4bec725d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. The presence of numerous URLs suggests an attempt to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://medvor.ru/uplcv?utm_term=descent+into+avernus+starting+level PDF link annotation
    • http://urbanconstructions.org/images/uploadedimages/file/62143245042.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b6418a293---3935949020.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e1bd7d3be---jerabopokasa.pdfIn PDF document text
    • http://18554080.com/userfiles/file/17277613971.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/zusanolekata.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/4aab4d0aa1bc523110cef22a8dd3aa47/40655821483.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/kamamalofivexasej.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16100595126d9c---jixol.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/zizawuxeronigozetir.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/waxudixodewagujuwitu.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/62745528869.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/dimanejebebemafuvu.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5f13b82fa---jemokubaxalevujova.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c17e836b3---baradaresokuxaramewumi.pdfIn PDF document text
    • https://foulardfotografando.it/file/tojuxogerumanexad.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/42242541988.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a242b43c5e---77697908542.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/8698f15dd7145f0976b83622c29fcfc4/85732400469.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/89989293247.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/44214691571.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/51052752811.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/fewoduxizilezamoti.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/sirobutorozivufoweb.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00016a9c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16A9C 18488 bytes
SHA-256: a7b3c0f3f19dee9bfe523e9c516a280bab09129e8146168bb74f92b82fed565f
font_00_sfnt_off00010d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D54 17272 bytes
SHA-256: 8eb4fb612968a19000ae010f5120155c09f134bbcf4df44bf12177bd3cabea02
font_01_sfnt_off00013a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A30 10572 bytes
SHA-256: c06e09a3a1ca9c30e15546cdc853d53ca694ddc2eea2a3c0e4c955c944578d10
font_02_sfnt_off0001528b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1528B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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