Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba2a3cd6b5d4756…

MALICIOUS

PDF

99.1 KB Created: 2021-07-01 12:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c497682318a8b1a07c39d5b17fd2f63 SHA-1: 467d1e8d4a56a2728eb28befeaa90f7576ee6d9f SHA-256: bba2a3cd6b5d47560997ccf826e7036e3d67239999dff1bb707c34eb89df171c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://studiobardinisrl.com/userfiles/files/87003264514.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/b3hk40umdkdj2jkfp8erq5rb3u/lesegogobivunagekix.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16093e77f954d7---rivube.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a3393ec1125---vimuxewewowidup.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/17781d612661336e7b170cc7caa54ad0/10547452487.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/13730fd6926a617cb8792e36d414c590/35597471515.pdf
    • https://ooo-kenk.ru/userfiles/file/99055818145.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5934dc2a74---bemuzajufagobevo.pdf
    • http://happy-travel089.com/CKEdit/upload/files/kobubefesomorez.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/465cfe4be14034838f045d8655320cd0/8317641527.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/36dbdf4ad4761dad47907e2021bcdefc/56504058926.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/r2fcecov9fj3dsjr8atsa1kom5/gumipulu.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609164a9e7699---80011924728.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acd6a2c08ec---duwenamubivenojagepumexen.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/tivevusalav.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/b16e2e9e910e4569f05878dfbbd67d61/81671130669.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3affb1a44---88151123865.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/bc7f6d83f2802881ec67951934f1c09f/vevibadawiwedotomufusafim.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/cada8cf740aa5c228bde4505e036ecb0/fepuborifubanilezelumarev.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/3be21e082ea29bff7ab9d8364d3dba3b/gagepenodiwexomivo.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/7c729c3f8118fea3b986afffb52f194b/wigizib.pdf
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/87407337776.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/2bf89d7d57e3065eb764a97406a18fea/porazovezagow.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=example+of+a+written+business+plan+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001201c.bin
58fd75b5472e7041f0cbec1fd5aebc72974352694fd12edba05b6046083dd567
pdf-font-stream PDF embedded font (sfnt) at offset 0x1201C 11072 bytes
font_01_sfnt_off000139a8.bin
bfc24e27be5b95b260fd94be7da38f2946af8e9eb9469a34a21520572fd713fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x139A8 17540 bytes
font_02_sfnt_off0001671e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1671E 16792 bytes