Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee87158260e7461…

MALICIOUS

PDF

93.1 KB Created: 2021-07-04 16:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e341cbc78e94b832580eadba6032a7c4 SHA-1: a78630336f8851eac1811bf58d5f975c142bf2d2 SHA-256: 4ee87158260e746145e82c347f78cfae8a1a743aedff6611d8155fa56ff0fbc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification confirm its malicious nature, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the structure suggests exploitation of PDF vulnerabilities or social engineering to trick users into clicking the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/d9c034bf03167499b3f39000ce8c768a/79419004644.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/bb9cd58f05eb3012d20b0a228fb07d73/bataxi.pdf
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/3babbbea6f4b0fc8ee71b7aaf8d839eb/fodiporenegidupanaxitopev.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160779fb531f9d---95520551660.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e4c84cafb---34603675877.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609846dded0ee---89520939521.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/0802b74fa285ae6c1a1c4ac3d3ba8114/93050125079.pdf
    • http://www.minaakshimajumdar.com/fckimages/file/lamofesa.pdf
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/98344452130.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/70b32e09f5798f061fe208365c953245/62527700296.pdf
    • https://zweefvlieg.net/userfiles/file/23885851757.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4dc8f1e8---tabawuvazimeve.pdf
    • http://lamachine.nl/userfiles/file/piwefaf.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763f664d86b---wolunevalikavozuti.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607788e03f206---loselumor.pdf
    • http://falegnameriacastiglione.it/userfiles/files/pemuvanufutekawanibakubu.pdf
    • http://siembra.me/uploads/files/66737440030.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/33f4bffe58b50a90e625c298f63ee62d/peguv.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/d2cd71a6a63bb9a54b85bffce5a9de99/633034621.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7be222b0c2ad2a115040c9f928011f7a/wadeselatefakisozi.pdf
    • http://nitexprofi.cz/userfiles/file/laduwusezijowux.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/pbouicdsq6e47g3mtle0b4l0n6/70863902227.pdf
    • http://eko-inwest.eu/upload/file/pokibasosukoxi.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8e01192f6---37345120836.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/4a0144594101b9a55d219bc2f91c02d8/zasulitut.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/defr65ekp48rju8hud7gi93864/63964791736.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+movie+should+i+watch+after+thor+the+dark+world
    • 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_off0001066e.bin
e65fe785421a7d21af3f9b9d7bb82cbe82a5c0c17eb50c51b7dc3fea90d4eeab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1066E 17652 bytes
font_01_sfnt_off000134e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134E7 16792 bytes
font_02_sfnt_off00014cfe.bin
8243897b2176235fbe640b7fdca8985f35b72bdc10f9944d3b28abebc7b7fede		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CFE 10976 bytes

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