Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf9f679b685591e…

MALICIOUS

PDF

103.5 KB Created: 2021-07-22 08:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd7978143d587b65aa1bced3a6139d92 SHA-1: 6015e7b0e6dac239120525a6d26b4ec04d3fd99b SHA-256: daf9f679b685591e3c1d3e0a4067b40277b8ae8914076608de517757cdf94ce8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, likely serving as a distribution point for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the nature of the link farm suggests it's designed to lure users to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071b173b3907---19704808503.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/f53fd2a7953a69742162cbf125ce73aa/sofomona.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/h042a1pp6vpqmiaprg0kojduv5/vulazofulexumuzoralulokoz.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c1c10ee0c---legibugigubosudujunixi.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/9761d1673d0f3a023f1ceb4c4f6c40f4/rawitebebipov.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/qbf1sisuv31t7ua2dtgtjijlaq/71690801164.pdf
    • http://memphiscentral1969.com/clients/865565/File/zazusikoxunaribomekewem.pdf
    • http://shqinze.net/admin/upimg/file///81646041114.pdf
    • http://otoozevran.com/resimler/files/61519281731.pdf
    • http://phanphoiongnhuahoasen.vn/upload/files/52399386230.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf883699a5---xakogugawewa.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607092e46aabf---petufimexixubobevipigote.pdf
    • https://ijmscr.com/ckfinder/userfiles/files/negovokobekugezupumo.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/328eigjjin84lnr65alf5ktb7n/pubelevatuxopug.pdf
    • http://permanentnimakeup-brno.cz/userfiles/files/wejida.pdf
    • http://www.climatisur.com/ckfinder/userfiles/files/pejubofopuvotote.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb295880eb---furanebumagamoz.pdf
    • http://cdwy028.com/uploadfile/file/20210629050153.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0ca1d65ed---vubebusakazaliwobowigut.pdf
    • https://ruedi-leuthold.com/userfiles/files/65457469938.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bb282cf24---117258900.pdf
    • https://debcopharma.com/userfiles/file/33933586424.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081969651fb4---87427747126.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/9aibqpv4kn7u0le6n1ubnlkiek/tadaxadanaluzaluwiwiloru.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=concepts+of+programming+languages+by+robert+w+sebesta+pdf
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ae0.bin
c26743b87dfacdf0858f4b0a7ceb4ab939aa0c8d2a68f1ccae901a3bec0cb177
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE0 16488 bytes
font_01_sfnt_off000121ea.bin
579ef22086287644a7c75e6468cc2a3a074523cb81f8a5384cf5c64a2d3ddc50
pdf-font-stream PDF embedded font (sfnt) at offset 0x121EA 18376 bytes
font_02_sfnt_off000151c2.bin
cbaf200e5f8c17421e21cada633b391ed011df8a463903012d5dd9f1aadc0d0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x151C2 11436 bytes
font_03_sfnt_off00016c6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16C6F 16792 bytes
font_04_sfnt_off0001847c.bin
80c3f518110c3ba57e6ddc3db78452093221897be0d2dd2dadc8b5580d2cdcb6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1847C 2080 bytes