Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf034ff450da0fb…

MALICIOUS

PDF

80.0 KB Created: 2021-09-05 22:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7840cf020289bb0be3bcf198a4bd6d12 SHA-1: 157e0f2db1c29382265f4e341dc9601319c88807 SHA-256: ddf034ff450da0fb2cf68aca6c302ee7a4a44ee694fb109f338f07192676d619
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external URLs embedded within the document, many hosted on compromised WordPress sites or disposable domains, suggest a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO poisoning or to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://nomylo.ru/uplcv?utm_term=causes+of+stress+in+students+pdf PDF link annotation
    • http://soudurelauziere.com/upload/editor/file/tezenuxexox.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210829102511.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/68d208b64b928836439ad3a5c7fcdbd5/74426359638.pdfIn PDF document text
    • https://abeess.com/userfiles/file/77762399859.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607445fd082a4---namofonemuganuwa.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/a2d646dad9916d9c85839855b11b1157/derimigasu.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160e9106432361---13028344692.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/b825be5c8868e70ae4f95b293a74e583/mipivuwazirikupupisoxubaf.pdfIn PDF document text
    • https://tcremich.lu/files/files/93836262105.pdfIn PDF document text
    • http://getem.eu/files/file/gukojipesewoxanepobad.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/caj8c42j6k3i3qhg6555vajgvk/fopilaxib.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/82233867574.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d3666aab3ce---bixiwazipebineje.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077596c947d7---22494893120.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c47527d67d0---47807988493.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/96502853186.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/35826395253.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/dazebanevodan.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96313e27e7---riloruxixekerofanarojufef.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/levuwomaze.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d45b36d6e9---malobitixagiron.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/xizolu.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/3960538575.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_off0000d674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD674 16936 bytes
SHA-256: 42c1f9c7f5c394f5bd69c674fac172f7eeade197c146ff1927b25eba67f03773
font_01_sfnt_off0001025b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A72 10576 bytes
SHA-256: 689a8b4ef04b0d38008e8327e52b61cdd2eb96a8af85469b9f8bf570ccc4664c

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