Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3414c940abf5598…

MALICIOUS

PDF

73.7 KB Created: 2021-06-30 05:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9898639d5f6caf2ad1a0fd348e8a5a96 SHA-1: 6458308f0d50ae085d979e9ebe19edb45c0f8630 SHA-256: e3414c940abf5598c4e39e62e4fe3290cf36b49d4e6004b161d2e2fcfedca6a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or initiating malicious actions. It also features a link farm pointing to numerous external URLs, many hosted on what appear to be compromised WordPress sites, suggesting an attempt to distribute phishing content or malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://numen-wow.com/userfiles/cloud//files/zazumegimebisigobuvuj.pdf
    • http://haustechnik-hagenauer.at/dumipitixukegeziru.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddfebf1bbd---4678696186.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f27af49c43---tepadedure.pdf
    • http://biosurfest.com/userfiles/files/28820750389.pdf
    • https://ludifrance.fr/userfiles/file/32090524663.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/76df9a2bf8be3b9353f73928dd99ebb7/demev.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/1becb6ae3fcc01f50d9d33e6dc90d630/43512277530.pdf
    • http://asustainable.com/global/file/65265184117.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776bf7d191a---laxadilak.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087dfb7127b5---jowibivosevikuvaxal.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160788b5bab4e6---fesozu.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/gli5sud1jcvfdnmq9k1c7ih4av/37974315176.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/8025568a5a9b7bddd30a9054cbb21037/89298572012.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/e5c2222fe2d8fc522f9bedf481f39164/81763765436.pdf
    • https://newchat.xyz/js/ckfinder/userfiles/files/sorime.pdf
    • http://longvu.vn/Images_upload/files/28800506917.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/e497733757eaa28491392ed45fa40d47/51192362648.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0bb84592a---pufakopedili.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160abaa618666e---25189201190.pdf
    • http://starwindows.ie/ckfinder/userfiles/files/46294501757.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c497bb05c1---vinajemezanuxoxowej.pdf
    • http://camwater.org/media/files/fatepo.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/c98c06c579883cafab309cd60c28920b/rijejufufod.pdf
    • http://doubler-son-capital.com/photos/files/xajojosikuzuwonemoj.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/9a342414f2273831d68abec8411b28a6/88886761784.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=shag+me+meaning
    • 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_off0000c263.bin
6235cbce90a4a8edc8b3aaff4509a452c4334da0559270c61fbac2aa8ec2c2c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC263 15936 bytes
font_01_sfnt_off0000eb7a.bin
1d93f496d1e1b7d1b2fa5e0ac3d0be8d4e5a3a004fdbdb2eebb66a7a42577cbc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7A 10100 bytes
font_02_sfnt_off000101c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101C3 16792 bytes