Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9ce7b6ecf6f171…

MALICIOUS

PDF

89.1 KB Created: 2021-08-25 13:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f64f99ff4058d002bb75c879fe31414a SHA-1: f9f4b6fbb28a0e36cb5e84773d89bbbaa8bb41f8 SHA-256: dc9ce7b6ecf6f17191b7af20fca43b4695fba7fe9b631dc73a4ec1931e86e428
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI links and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://nomylo.ru/uplcv?utm_term=funny+faces+using+keyboard PDF link annotation
    • http://tourbusan.net/FileData/ckfinder/files/20210717_D9794B8B7CD79299.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/58196561804.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b583b9374---vezuvofexe.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/vifoxegarilojisasox.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/07/06/58943772644.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/burutibirikogeg.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/15975181950.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/rizosizupusogalugud.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/vomununigagaxefoko.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c552c668fc---begonadivifaburexej.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a27c9139e31---77921499763.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070b266e4997---kefano.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/remifesageguwaj.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/digokekoturixutivajaxix.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaa3c598a6---lilomupepazusirovezifeb.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/teluwibunesumotowe.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/faxiropudanitokifopid.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/ridikumipewakox.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/2c5d0d91d65cce3d83cf0c22839e2224/kepowulipawi.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/mojop.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/57635577657.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/xasopumazozowan.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/0333ef760046e5e90ad685d6658429b6/fiwagifilavusitigizika.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
font_00_sfnt_off0000c717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC717 18892 bytes
SHA-256: 6cdf8bc0ae77e1a10ec94fccaa29e5deee28886980b7e5a941ec7b132a80eeed
font_01_sfnt_off0000f946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF946 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001115d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115D 10932 bytes
SHA-256: 16e60d0f5633b3c482b4b880c484f0c9af9a51effafa2c1731d012b85c1ef95b
font_03_sfnt_off00012a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9F 32320 bytes
SHA-256: 2236e15194b5fe8eba9cde30f14ad3b335856e49aad730aab21390c680d0e914

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