Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c41c6f6031f3850…

MALICIOUS

PDF

89.1 KB Created: 2021-07-04 01:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80623cf7218a7c92151a210a16b1fc4a SHA-1: d5de57493447870d1382ef7297e24fe120b8452b SHA-256: 6c41c6f6031f38507c5fb9c890e003aea46a0e05c6a31a29c2920edf11a1301a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of external URIs and link farms indicates an effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://irlanc.ru/uplcv?utm_term=law+and+order+innocence+cast
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160739d62aa02b---xikasop.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/gli5sud1jcvfdnmq9k1c7ih4av/37974315176.pdf
    • https://siam-royal-view.ru/data/files/datupusuzobij.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/db41de019ece1b36f6eb19062a9fe498/dutomevakuxito.pdf
    • http://thaoduocquyhiem.com/userfiles/image/file/86735005418.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160809d9aaa47b---97002292989.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607902e0b57a3---33716027722.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c56a6aa3b0---98231539063.pdf
    • http://podushka.by/files/files/21955790852.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d435de542b6a7c7cd0f07dc8ac7e3228/85834603070.pdf
    • https://superchills.com/userfiles/file/penewosinujelig.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/piraxezika.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1dc8c2cba---52876680710.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7d35c9591---tedupo.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/0bde3907426c1ef9a0a8f629d6980135/54157933997.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7473092553---luligorisosirexamep.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a7de3651c71---gojonexajobit.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940563d0588---65036098317.pdf
    • http://paoladebenedetti.eu/userfiles/files/wizem.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079e5f0494eb---jesodenakuku.pdf
    • https://jeneifogaszat.hu/cikkdata/files/tegizemazatiwetikugejod.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/10bbf85db26283f97c62393b3ffdcaf4/84398707902.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160700bdf320c0---likilovefivalarotofopag.pdf
    • http://amphorabeautyclub.com/campannas/file/noxujakotogoxaz.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160947fd809a90---43390919247.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_off0000f83d.bin
86ccc66242f5640ad44f073788c479a1e5b55a55ad7ca270b7bd53dfeb439934		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 17340 bytes
font_01_sfnt_off0001258d.bin
364060c17b80293aa77688dd2259961454dc0160d001131cbdb0eb6202b0bbc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1258D 10360 bytes
font_02_sfnt_off00013d1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1F 16792 bytes

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