Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ec9ed498365d8f…

MALICIOUS

PDF

94.4 KB Created: 2021-07-07 12:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3055ab3975371f1af868b0ebead3fdcd SHA-1: 8905940814fc7dd788aa019a6ea88b398dd8eb3c SHA-256: a9ec9ed498365d8f170a52ca89569fe124b8ab4e3fd20d2a9fcfcd0c3041614b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to direct users to potentially malicious content or for SEO manipulation. No scripts were extracted, but the structure and URL distribution are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 5

  • 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://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5948b8ad2---madibufobupozitawu.pdf
    • http://capital96.com/userfiles/file/47395290594.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097fd0fb8993---fisavifofonexuj.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160850a9f161e2---lawidilibuninigixatogu.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/871e05df1dc3f3372bb972f6d6c1f6c3/94749518386.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c449e084fd9---22936556276.pdf
    • http://drironcat.com/images/file/78863505914.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/gewisepanovobiwe.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a0dd862e1---fadibojokavagewe.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/99078ea7d24cb0feccade370c4188189/61102197524.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8945cebfd---liduvilufuki.pdf
    • https://mosallaesf.ir/uploads/ck/files/gufidezegojisarodon.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dcd08d859---49923260267.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cebaae22a6---sujabaletopukulije.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c233732b3c1---17210858744.pdf
    • http://mobydick-band.de/fckdata/file/nopudov.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/b02f1d82945dab3e43d8d3be4b3900d1/99809791080.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/f25ff98fb1e0fe44e8ec0a752e8d9aef/69234195461.pdf
    • http://akinmedical.com/uploads/file/gezose.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609c34ea2213e---80407186741.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e518be2b492---benokerokemelidugewetal.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/t758tcep0jh4nionpdqp62phir/90879624204.pdf
    • http://waypl.pl/upload/File/sezubawoxikolane.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/7a13d3dde54f1835437c4cd65470f816/40893237773.pdf
    • https://123natura.com/stockages/files/25676831601.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=wow+best+horde+mage+race
    • 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_off000109d3.bin
a1235bdc064ba9710820403988bc11b75b2101971125b8dd23bb746942cc7629		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109D3 10796 bytes
font_01_sfnt_off00012299.bin
e64b4a4cae6d05f55e8c3bfc490b53370863a4654dce450de4e53c1443f9d538		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12299 18260 bytes
font_02_sfnt_off000152e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x152E2 16792 bytes

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