Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1cf9c3453b406b…

MALICIOUS

PDF

71.5 KB Created: 2021-09-13 14:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fc78bbb6efc5c075afc4cbb156b90963 SHA-1: 20625467e770c968c4fae8d8b43cf98a48100387 SHA-256: 9b1cf9c3453b406bdce74011302a40d2bde53df82d16020beafdc39cd92db80f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress sites and disposable hosting, with URLs suggesting a 'download phone companion app' lure. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing campaign designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://krisoc.ru/uplcv?utm_term=download+phone+companion+app PDF link annotation
    • https://jnnjhansi.com/userfiles/file/80701852049.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/sabapegakibotedizomobo.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/wuxunujirelomonivaminatug.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/sutajipomulobilujidud.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/kawidopukopilof.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/fd3405gutt9qv9bd5dthi3qb72/50104897733.pdfIn PDF document text
    • http://hydrem.ru/images/file/91911180989.pdfIn PDF document text
    • http://vhktn.at/images/content/files/voxonoguxinabafepu.pdfIn PDF document text
    • http://carbontuning.ru/file/pawawojuxewevetejir.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/6269257146.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a03b101cf3---pedurinudisulusudat.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/faf5a9b523feb8349d4a8c6c27ce32d3/97942109400.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/61835490739.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/6248402363.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/45289892131.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/cb6fec483bc062cbfe89e125c3bec346/44889892997.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/roxuzerux.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/32507867482.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/23478848800.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/12932108748.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/6937199530.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/72067322379.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/pefitibifogefolotikixage.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32021227774.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/zatozuzasovi.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_off0000b7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F2 10500 bytes
SHA-256: e242cd88af1685853867f4e109068d9033c61b9e56e32621fc90ced65212ec46
font_01_sfnt_off0000cf94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A6 15980 bytes
SHA-256: 161ce33fd2d2e2c8df8e4f95c2266b178ec918c0f27f93a43859f614b8e1aa38

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