Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e7ef8001d36c45e…

MALICIOUS

PDF

79.8 KB Created: 2021-06-27 09:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 81b0bac3903ca4e06e135c1e4e70aff1 SHA-1: 6341e0d2a4b32740f6aec1cdd65f9be3300b5c8b SHA-256: 7e7ef8001d36c45e5158ebfc09913ec321498aaec4ceee585dcd002220a92acb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF that contains embedded JavaScript, which is likely used to redirect the user to external URLs. These URLs are part of a link farm hosted on compromised websites, designed to trick users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=last+year+question+paper+icse+class+10 PDF link annotation
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/r9q548fe9t1jl6vgdlsu1fqnie/vavudoxesabovebo.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16209822776345.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079325e6a2df---fetomiteb.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/v6iked306rukgm757b3c1kj021/tudedokafonuv.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/7961f59d584409afe8247503ce22b777/90294624577.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/katasupadarasiz.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a66f0b2d5d6---josuxolilasusajepi.pdfIn PDF document text
    • http://jarosi.hu/files/file/ronutaxiwosuzamiroravago.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607764059ef16---64409238879.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/85067520825.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/budi1t7nta6lkk9iloqjb2nf2b/poxamegurewijotudevolale.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a96d2d9a2f---69791540637.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a54eab212---nomowoxozikofufixawa.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/84153608702.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/82936025649.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ee3f18e5e---tologotikonobagewiloraga.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/pasujenifunukewunititok.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/23706273431.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/0j8b9huotjien304sg0sdmkq76/xexijefevoku.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/8a1bca29ebe076c5f596ddfee5f0f675/84165565609.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/fametezisipubitu.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/af071e75265f882bd900b7175db151d8/86033337036.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606da17fcf0f1---43251350351.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/47480868658.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608754ef26bea---22985808505.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092446a93830---xajopanelutepobodim.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/zowidoxetiketememo.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/49144849231.pdfIn PDF document text
    • 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_off0000d292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD292 17700 bytes
SHA-256: 8b5c5c64e65a7056238f5bbd034aed0dbcec64f681aac96a810d9de454f00b55
font_01_sfnt_off0001003a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003A 10856 bytes
SHA-256: bc271393e24d0195cb4f8df14c91c69435bb73176cb336650c1ed66b6b27c444
font_02_sfnt_off00011981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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