Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a8b8fbf7f4d0d1…

MALICIOUS

PDF

72.0 KB Created: 2021-09-06 04:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: abf3276a25224c20c51104242678074a SHA-1: 70177101be1031116dd1894f63680db29801269b SHA-256: a1a8b8fbf7f4d0d193c41cf2f8b4555236de178bcaf0b5679f9e6d0a675371dc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. These links likely serve to redirect users to malicious content or phishing pages, a common tactic for distributing malware or stealing credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/86298659882602cc321a46f68def03e8/80912716995.pdf
    • http://unseenadventure.com/userfiles/file/muxunezonam.pdf
    • http://www.bongbansaigon.com/uploads/files/18621624659.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16075e751d307c---62456621560.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a21094ca813---53055469533.pdf
    • http://csc0351.com/userfiles/file/20210721142734_up4jmj.pdf
    • https://aqua2go.pl/galeria/file/31614799472.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad5e5763b2---palubuvinuzojodet.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ccd69ab4d---91949681909.pdf
    • http://poliinc.com/upload/files/suwofebov.pdf
    • http://portalcom-b2b.es/img/user///file/_0293818001623900437.pdf
    • http://staceyasp.com/UserFiles/file/bemubizipuweneri.pdf
    • http://zjqzzx.com/uploadfile/file/2021062302503973499.pdf
    • https://aawyx.com/sites/default/imageuser/file/20341402699.pdf
    • http://vpecargo.com/userfiles/file/33057469960.pdf
    • http://baaningdoi.com/file_media/file_image/file/65617879950.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160705c26a68c3---gigezo.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/d797ef7d88d99b7e3bd9d2dec6e5e4f5/xolun.pdf
    • https://pt2-turbo-j3t.com/contents//files/rekokidanogisewe.pdf
    • http://bpabv.nl/uploadfiles/file/43759216315.pdf
    • http://labonscafe.com/userfiles/fulupibedokipuwos.pdf
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/keximuxabevofot.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/1a3ad3e0ee1a184bc55f5b7af3765219/38985100716.pdf
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/34064644466.pdf
    • https://cr2tek.com/userfiles/Proj_Name/files/raduded.pdf
    • http://www.electricman.in/demo/frontend/web/uploads/files/48657853145.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=animal+sounds+worksheets+1st+grade
    • 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_off0000b86f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB86F 16792 bytes
font_01_sfnt_off0000d081.bin
53338f1cdfe7ba8d7ff3f914663bd4d46d6c20a9551f4b6cd625bc7a430abccd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD081 15732 bytes
font_02_sfnt_off0000f8ee.bin
67df852bae5d12b84a5867a92121a391751f566a134f06ed19838d2e04197cfb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EE 11008 bytes