Malicious PDF — malware analysis report

Static analysis result for SHA-256 abfb2a9b0894d81d…

MALICIOUS

PDF

84.6 KB Created: 2021-07-05 13:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a19fd2116aa24fb4cbc58a69ece04d17 SHA-1: eacd3b5d3c32cdc400a00a9dc9b1a2ae11e754f2 SHA-256: abfb2a9b0894d81ddf9de2f68b8c8873fd409ea625f6f5b208f9437653306bd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload directories, a common technique for distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to trick users into downloading a second-stage payload, likely through a compromised CMS upload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.tiande-global.com/ckfinder/userfiles/files/mowud.pdf In PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609232df410f1---roxozorekedikemipoturipax.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/e510heb0tat1m44qfk9v123f3r/53246633114.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160709cde76bdf---20456887186.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c86225b0b2a---botizesifevukijaw.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/16962546323.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607005b307aba---81348404077.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab49493144d---wusajekezozasozi.pdfIn PDF document text
    • https://adikkedua.com/contents//files/27175953762.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36ea3d104f---17179487025.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/5752229205.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/rufozavut.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/20537891144.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/o2jfegqvcq13hjptrb7vhaufb2/29189943300.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/e432a50469f78e588fe1f76a562608b0/81145641857.pdfIn PDF document text
    • http://allasclub.com/campannas/file/10436066020.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/ef2bd8e52c33c48f12913a21f4c8dead/55866519282.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847b546ee48---nilolakexunotuvofat.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fd6f72442---zafufakoxiz.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/tipuwokigodalin.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9fd9c1085---kuxivexisowubetakoporef.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/ruzaviviluxerabamiv.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/6f4b092f56decb66b887c45ea2ddd0b1/98537574440.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/4295a727e1d57c5b64063ab3fd1e9855/niborog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ssc+10th+class+maths+guide+pdf+free+downloadPDF 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_off0000e49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49F 16804 bytes
SHA-256: 14551eab4dc77f159c246c0275dc457ce9b85d73bdb951b79d1f82aed451615d
font_01_sfnt_off0001104b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12862 11500 bytes
SHA-256: 0d1ca9273a62af011c4731e69bdc0cf018c4e5ac8197eba408329735b7bbd177

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