Malicious PDF — malware analysis report

Static analysis result for SHA-256 b157853d67276e0b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-10 06:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 735f853d9a5aae01c0b02dec7d85242e SHA-1: 562ee363af082337a9c92dbfd194ac131e894a9d SHA-256: b157853d67276e0befd1af23182d24b9d8e91ff199532c5f22fca47ab4b54f53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicates a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://coretry.ru/uplcv?utm_term=dude+mikrotik+android PDF link annotation
    • https://gbagencement.fr/uploads/file/dokalarav.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613036285b8ed---veboparewekebewuno.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89928237411.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/51036574229.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/65406031232.pdfIn PDF document text
    • http://duef.ru/public/file/tebuxutodubutorafubal.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/bodusagadowomebirafuj.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/kaxizub.pdfIn PDF document text
    • https://samudra99.com/contents/files/25162551598.pdfIn PDF document text
    • http://amandamaitland.com/images/file/71604500510.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/35404676339.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/digutikinapimibiropixa.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/5634767333.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/29265897421.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/guvowenuwexi.pdfIn PDF document text
    • http://df-2.de/images/daten/file/57716027274.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/wireleboj.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7c4115720---zupewamiteribeniligogi.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/64369790572.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/binenovinupoxesi.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/4022019213.pdfIn PDF document text
    • http://medrea.ru/upload/files/puvazivagaweto.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad2f589a76---72167856133.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_off0000bd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD44 16572 bytes
SHA-256: 20f3955ca03c3b3b671a58c2b4f4829a4bc18d12e9f5ccaa9eeb2cbf0c6206e8
font_01_sfnt_off0000d479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC90 10388 bytes
SHA-256: 36e73c84716eeab46c1977bb5ded12e8b31cbb7dde8fe794c7d86b9181bbce7a
font_03_sfnt_off00010405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10405 22960 bytes
SHA-256: b7ddfc85c111c54c59b798294700e8d3b8fbef76929794cf16787fbc744d103e

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