Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e368fbdbd592f87…

MALICIOUS

PDF

93.0 KB Created: 2021-07-20 02:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72c9dfcafd56cebfc465fe1a348558ac SHA-1: 18180dc92e49ec8987e882b12e2b20fb6151a721 SHA-256: 8e368fbdbd592f87a4b7413116ed16edd07d5d9136b46d74e5452c695e272bca
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or appear to be part of a link farm on disposable hosting. These links are likely intended to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://wp-kancelaria.com/userfiles/file/kakaxekipivekuza.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/22f736e4dbb6730cc30eab6fff83a9a1/1141836008.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e24f9bd58de---89534526794.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b47f8a7ec---dowulekalujepaxumudezadoj.pdf
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/xegisemizuvemuruvi.pdf
    • https://duproject.com/uploadEditor/files/kofekenezugigexepab.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6771002d4f---rosewowiwujaxilubalezus.pdf
    • https://cuisinescartier.ca/upload/editor/file/lojigupuko.pdf
    • https://www.hmgfinance.com/ckfinder/userfiles/files/31027887259.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4590e0f5e1---19964079868.pdf
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/vedemoraxaselux.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2d4912cd3---79397416149.pdf
    • http://bigband-ulm.de/userfiles/files/xipunubugelotod.pdf
    • https://dgaspcsm.ro/ckfinder/userfiles/files/21970845261.pdf
    • https://kaktutzhit.by/uploads/files/94295177907.pdf
    • http://archpiudue.com/userfiles/files/35867308126.pdf
    • http://www.alfapilates.pl/upload/file/tezaletaxesox.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/d369rm8sghgac3fse9mlit3ov0/nadepovab.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/164d719e2f828657524e70ba2676f302/nerata.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160766f2727c7b---71527349128.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607627ee74406---92648459092.pdf
    • http://filatelianumismaticaumbra.it/userfiles/file/mizetavelolelurij.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b99c092d821---11518618323.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+ocean+at+the+end+of+the+lane+questions+and+answers
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f016.bin
57c27551f8dbc773e09f887c613aba85961be659d43319f27e2b4974541a95e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 10868 bytes
font_01_sfnt_off000108ff.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x108FF 16092 bytes
font_02_sfnt_off00011e44.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E44 16792 bytes
font_03_sfnt_off00013656.bin
495a2b0117b03d9e199424ddc9c4b9cf41a291e591f577a8475e1ec4564b837a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13656 17440 bytes