Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e61465765994303…

MALICIOUS

PDF

91.8 KB Created: 2021-07-01 16:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6907659c8c0ae1494ed0a1147e044dd0 SHA-1: 8bf7d2f6747e92df5e3a8616367f55c7a791478a SHA-256: 9e6146576599430387b1ddaf6dd1ff3a082590a40949e0fadd28faadd092ed3c
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded links suggest an attempt to lure users to malicious sites, potentially for credential harvesting or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afb42222fd5---vamirumawenuparedagosade.pdf
    • http://paliukenas.lt/i/File/55346517916.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a625c422d5a---23818720282.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a168d5c9f60---rejasiridubonabulenorapub.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ef214d313---zatomiweforijef.pdf
    • http://zae.me/datafiles/file/desobujamefanoxugatomoku.pdf
    • http://parkhigh65.com/clients/4970/File/gebivatuzuk.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/6c0f9b5bffe961d136a064a71bc77f5f/rinofidiwog.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/ginaguwaxizobox.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c81b87c32---zamixomulujubujapifexel.pdf
    • http://billsky.ee/files/file/rabikomuzowulixiw.pdf
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/zirijowut.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/nhvmstqjgmca3a2eflhi2in7ro/91812506834.pdf
    • http://npi-management.org/ressource/site-image/files/lanatujulalijolud.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc40d48851---5462840843.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa3dd4f451---99292324831.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/e8ff5f67674f328871df7ccced932f0c/51870571211.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1281552a6---tuxebelezunalugewusado.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/b8p3tic9j662tp0i7lspk2ptbg/83837473769.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/d8b36dbd588980aad49bb5b983f31aed/48657756925.pdf
    • http://aircond.md/upload_fck/file/jupaxinemewow.pdf
    • http://creativetechno.in/userfiles/file/tevikezeraxogifur.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/d8c768a1950fd1de4d5a47743ed53e3a/zafirifuzeduliji.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a98fa5df2b---13353677180.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/rugrp6n83kgg631pl3iju3rc32/92882443294.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/567ecce3f484d35c1bc680da074bb13b/lebepufirezuponunijur.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdfb5f14ea---40566116905.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/452lhrdijc8k9cvjigv21rplgl/57533705547.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=in+n+type+semiconductor+there+is+an+extra
    • 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_off00010445.bin
688d4bd04caeedb787dec9c776284c493ddc6dc8f31ec9f70bdc57c5bf41aced		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10445 16732 bytes
font_01_sfnt_off00012f90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F90 16792 bytes
font_02_sfnt_off000147a7.bin
11ff0609ea2b7609d34e384cf1b1fa450f7b11be858868ac12210b62142778cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147A7 11000 bytes

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