Malicious PDF — malware analysis report

Static analysis result for SHA-256 a642ecf337e12cab…

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 04:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 30274e5d0987aa50f1981827756383b7 SHA-1: b2af1cda15e7e1f9be726c3c4be586f744ee5e43 SHA-256: a642ecf337e12cab7e9adca04b61a4edc5cd46c18ac6ace7c2bbd9144aaa4687
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b42fbbed836e8383ab9eed2c4511b49a/zejimuwebaji.pdf In PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/ladureforikefibam.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/jujasugodidefedalazinux.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/0vqtfjihto9dk9dk5gm8oths3e/36979822532.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/3d997476057998680ff079e3ea531e82/47594861430.pdfIn PDF document text
    • https://rajakedua.com/contents//files/bisijolupowejoniranoruta.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/vf7rrrej43iqcnku5aev5k7da2/27200935484.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74bf9d94ec---87508905558.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/74fbd4e70313fd1044b5eea9348f85b1/78011892786.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/9901d27f7fbad61f9b4dfb730850affa/48058745981.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/12ffaf63e4b0db5cfb16856c69363274/31779123344.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/92247409943.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bdvoi8cn67eq2okhvb69mhf4n0/xejasavul.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607751e268459---20248288408.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/lepizakobetebej.pdfIn PDF document text
    • http://ned.ru/uploads/files/73210307770.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/fiweroduwaromapivasese.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/89702926344.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/84267027860.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1e64352cae3bb913d92c8816283bd50f/63538753051.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/ragudolerusejina.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/donoxam.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079091ddc663---5981571520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=quit+claim+deed+form+pdf+floridaPDF 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_off0000e372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE372 10668 bytes
SHA-256: 384302fae8c9f8f00bedd3f0ea527441685de8171620738b9b053f9cfb86812f
font_01_sfnt_off0000fbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFC 18796 bytes
SHA-256: d2441b32f15db38760702bc5abbaf7a48a626b7bd235360a4ddecc90fcf2f991
font_02_sfnt_off00012c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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