Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f7ef45dafffdd5e…

MALICIOUS

PDF

77.7 KB Created: 2021-08-29 16:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d2620ba6df8dc694d42f14cac2e668fa SHA-1: a7a58e9d2b4ae3f67265db0acd524f833204cff4 SHA-256: 2f7ef45dafffdd5e67c32d8908e014f59d2caf124961ff95c74c3a00340ef4cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress upload storage. The PDF likely uses JavaScript to execute malicious actions and redirects users through a series of links, some hosted on disposable domains, to obscure the final destination. The presence of a link farm and compromised CMS uploads suggests an attempt to disguise malicious content and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://esoftland.com/userfiles/file/vovetomamefarivewuretola.pdf In PDF document text
    • https://actor-conseil.com/files/file/31068645840.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1610889952f288---nojetogaxewerel.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/tbgm9ag3ojd2u0baild8sg6aru/95302579231.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099bc8971c05---1687703942.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/17036920369.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/33680ab31858ee98c8c96eff405f086f/30295968365.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/pabajidipabifekekugufu.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d186619eae9---95017263725.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/625535269.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/27402344925.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/1ce9fbe0c57c2409913cc71b9d0e3099/gezubipilebuwiz.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a151c884d47---kedonel.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/24116201680.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/gowimujoveridaxuromuro.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/3e0eb0b66738da61a690b11eb478797b/xazolafijebejazaban.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/60903478982.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd777d6363---wukubofozotupowanijadi.pdfIn PDF document text
    • http://supporttmes.com/clients/2/26/2647aeee05d38019bb2ff7af4ee9f9d5/File/79434186776.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/op5g06eim8fddm601duti51c80/79702674552.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16092a1ca365b3---sagidudob.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/jagulinum.pdfIn PDF document text
    • http://chipgene.com/image/files/20210701_153520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=boy+names+starting+with+an+lPDF link annotation
    • 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_off0000cb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB76 16892 bytes
SHA-256: 9c6d8139afe0f7bae5eb1789fcb59c075b34900c451c46171cdf2d25f14db809
font_01_sfnt_off0000f735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF735 10808 bytes
SHA-256: 708c8646b7a2e5110b19aff9f9fdea23164a488239dac8ca865fa4844af24b44
font_02_sfnt_off00011006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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