Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8d213cfe1a43ad…

MALICIOUS

PDF

86.7 KB Created: 2021-06-27 20:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0627e21a4f45bbbc70921ebd93ce72bd SHA-1: 8e95f4db322da3a4a138214d11aa141ad064b2b4 SHA-256: 9e8d213cfe1a43ada6f10984d21a2b97248ee1aab52664e7f43fb1d524967a8a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The document body is unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/u1kpargjhprusr1nnfs7c2r7j1/67995750229.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2b9829f325e4599e1a5ba4ca8192c17f/51266129140.pdf
    • https://marljivo.hr/userfiles/file/38228546243.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608544e8143be---babavoka.pdf
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/xufudutam.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/4f26b2193f68a53f7a9afd80724ae481/52977624149.pdf
    • https://gionggiacam.com/ckfinder/userfiles/files/96769168329.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce971c0227a---89052202454.pdf
    • http://resetimpianti.it/reset/public/file/87758026460.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ae328c726---tonagufiz.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/8d526537647c322cc109e7fc81ff1e4d/xololarux.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/a7644a23686843604205fece8493a407/63799000912.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074173862224---95024978924.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a45238115d---finemekisojolivedivegof.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/wuxuze.pdf
    • http://3q1p.com/upload/file/210617123732031582zo3yeliumh7n.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089dbd2d5e10---kitonebe.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/067d193a23c95c0cfee5d2e44ed51a7a/74823164220.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/o2nd1svk7goi5k3pburoa9kt8m/76133243336.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb4cb534de---wivamusuvudekexujoton.pdf
    • http://agataklimowska.pl/userfiles/file/labiga.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/3f9ea1f54a0694d97785217848ed31d0/bimefemesedirexali.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/l6upodhvam74ropu3l0r2c5674/taramedojijisozovefaw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=first+aid+300+classic
    • 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_off0000efff.bin
defa5702c92d3a27ab9f30b5b0f5d2b827edced4d9c26892fafbe1ed74ab03f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 17684 bytes
font_01_sfnt_off00011e6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6C 16792 bytes
font_02_sfnt_off00013683.bin
8dc6143fee0a44ce6575cb9b238c1b2a92e3e6615d3c752fc3c72f4799d8281d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13683 10276 bytes