Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff698d9bf306e95…

MALICIOUS

PDF

110.0 KB Created: 2021-07-30 09:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0ce24f87aa26b012ff9df405970eb36e SHA-1: 5dd81377700dfbfef16cfe6347ecff3de1b3c85e SHA-256: 1ff698d9bf306e950b8bf7203d2050d1459d79287987eacd01422b5417002c1e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://drapikowski.pl/uploaded/fck_files/file/18868988409.pdf In PDF document text
    • http://debseven.net/UserFiles/File/nolawewivojuzevix.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/75595426873.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fb9019963---kojukira.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/h3dr69caf7pen4evbffhn2t025/zimesek.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/50250611569.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/18277588965.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/latutolewonimuroripojevep.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbde3bf0ff---94761048578.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/f52af9d7da1b0100c57f96b0236e25d7/suluposujosudolafinive.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/10992420730.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072570023054---55523066938.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/belarenisevotijugexi.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/82311406264.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071ac3f5e537---pobalekule.pdfIn PDF document text
    • https://unosms.us/userfiles/file/12889684050.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb9cf3a26c---88481082351.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/p4s46d72uq0rvfvhctjtc0dnp3/poregokirinikofugisojed.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/fff245387c80c7d071a991874ead3e03/74434039168.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23e8778652---gifutidanipe.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/75023561278.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/nulujixemogatenotisumube.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a78c5e0f2c6---49995133595.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/tivikigelof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+pair+powerbeats+3+wirelessPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB0 10528 bytes
SHA-256: 26b47b06cbc471ca6093ec7cd9f17021c5d22f5dc5dc6b3b2083d9f20d81f31a
font_01_sfnt_off000162a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ABB 17772 bytes
SHA-256: b4ee8fb65b084d90a26aca5a8c9a6ab58fbc597027861d40878d9e24e443cc7a