Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f72a6f5c9df826b…

MALICIOUS

PDF

79.2 KB Created: 2021-06-30 01:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d67c25f2d2b84dca62bdf94e52dd9e4 SHA-1: 1318dba068ce1f4f90009a05081b841174bded87 SHA-256: 2f72a6f5c9df826b1cb05c3037dc8094f0bb1ba73a206ecdb210f3375013eb7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other potentially malicious sites. The presence of these links suggests an attempt to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://huntic.ru/uplcv?utm_term=easter+21+dates
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/f2074bde4b81718abacc08142c6d602d/75303271337.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/7tktjiccvadq9dsliq2nd302ih/93222894514.pdf
    • http://sugarfree-gelato.com/upload/file/25598141668.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074498f65e6e---64443779624.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57fd2a8817---gixizotapepojepalojujubex.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/qutgt0miokie2itlgd3ko7fevf/koweluno.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/u2j9qu5lasqba56tn3eq07nsot/96140831473.pdf
    • http://magendans.com/imagefiles/file/lijulaxunosanoxagowon.pdf
    • http://market-oborudovanie.ru/upload/file/34420502576.pdf
    • http://domusanna.it/userfiles/files/2632792890.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd05d184c8---29906188185.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/bfd23fff7c01c95a747e9b9cfa158090/5367943709.pdf
    • https://subarini.ro/mm/file/89923457342.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072c1d7cbdca---joleropiparijafoki.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160806e2f3d3f5---vuwomoduk.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/4c41760b060042de923e3032c70d8ac2/letabi.pdf
    • https://rtvpuls.com/ckfinder/userfiles/files/kimelarefamaxuka.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c090c3dffc7---3297940641.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5f7bc2df4---dopulopavo.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a17ec9cbb4e---zilidubukasozixolade.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdcd6f2792---89537652854.pdf
    • http://churchtextile.com/userfiles/file/nezomebedakilub.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dff7154d7f---95617586732.pdf
    • https://klcmekatronik.com/ckfinder/userfiles/files/71405261731.pdf
    • http://jkphotocon.org/data/userfiles/files/24947869550.pdf
    • https://amrapalispot.com/userfiles/file/lipaverinex.pdf
    • http://antifftech.com/uploadfile/file///2021051503313895.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_off0000d6f0.bin
544a3279affb9c09627b2d8df07dad167bc8ef4106d1f5cc2eae8073d4aa02e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F0 10032 bytes
font_01_sfnt_off0000ed74.bin
6aa1b9c4ae26666ca8b7115c3f61dce4c4d795573fabd2f51f94b5792895299f
pdf-font-stream PDF embedded font (sfnt) at offset 0xED74 16360 bytes
font_02_sfnt_off000117cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117CD 16792 bytes