Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d056608160e50a…

MALICIOUS

PDF

91.4 KB Created: 2021-07-04 15:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 535b22121a89a8799e04c9b55d153aec SHA-1: ee721b35bffe5901667c934d5d3bde05ad0f5dc6 SHA-256: 88d056608160e50a4dd712d525ad7d1eea7fb41fe810a74b02ed42bbfc25bec0
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous outbound links suggest it is designed to lure users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/74abe4f1f49f49bd069b2e061eb01cc6/24110883137.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073459f67776---posetozujutotoz.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/d86936a36260ff8b37640ac15890f7e9/77693312644.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/0328b58371f9c1dfc727483af3ed395f/13387135179.pdf
    • https://arhometutor.com/userfiles/file/56159247395.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608657e4daa42---79911139121.pdf
    • https://brianhigbielaw.com/UserFiles/file/wabirusiri.pdf
    • http://txextremecarts.com/userfiles/file/84189842501.pdf
    • http://gadkowski.pl/repository/filemanager/file/neneguwi.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df74097e385---sixobat.pdf
    • http://autoscuolecasetta.it/userfiles/files/fogut.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/oreah3qmisftnmuav0b1u66934/48806189911.pdf
    • http://jtour.vn/userfiles/file/kujumi.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/safesokowasorezefuzejuf.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/b73b37e9d271537da50bf6643e77b1a3/16272360488.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160934e2976de1---80378320025.pdf
    • http://plncse.hu/php_data/file/gatigozafelob.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160774ba3d53d8---dekezexilarez.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a12c3af70e---94003287436.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b77e5a20716---kipoxitiwod.pdf
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/95496938344.pdf
    • http://aite-materials.com/upfiles/file/bigojarujutabev.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/dnvs1rb8up3rnp3hjh957ht63m/15781183388.pdf
    • http://auksozvynas.lt/userfiles/file/feramovajetixepumazek.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=idiographic+approach+example
    • 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_off00010425.bin
c03bb226b8aa746137675664a6254a38a2418286523e59dbf51339592b487516
pdf-font-stream PDF embedded font (sfnt) at offset 0x10425 16988 bytes
font_01_sfnt_off00013058.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13058 16792 bytes
font_02_sfnt_off0001486f.bin
475679c1553c361e7fc72cb2063f92f7e8f54c46aef595db79fbcca9e2fb9594
pdf-font-stream PDF embedded font (sfnt) at offset 0x1486F 10644 bytes