Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae6b2cb6d7912e1…

MALICIOUS

PDF

99.0 KB Created: 2021-07-21 17:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ca58d5204c7b97fe05422f666fb46e87 SHA-1: 6294f559c8ba645a67505603099ddc737f092956 SHA-256: 3ae6b2cb6d7912e1e5813afd4908c7d2ac8832b14086052c3114b08744baea9e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to potentially malicious websites through a deceptive link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/bf93f87c555a5947f5321cc86f6e507b/vejevebepizomunekis.pdf In PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/gometu.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/59153033968.pdfIn PDF document text
    • http://xtra360.net/campannas/file/vojujuxixafepunifo.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/1d1ce08798d280ae7a42ea1df315a9ea/81035563570.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///15988862620.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebc48311c5---36536968607.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1d50ce3a7---31008846257.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/gufuvizov.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1625000386.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/13224288727.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/wizomakujumubekim.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/torimexelawasiget.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/sojuvuzovujepudozebiz.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2d410d775---farepixifove.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/dewene.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/sepakelaworojisudalufabek.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/bufiz.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/2d160f3d79db0a58377f547fd9d75cb4/95853111828.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/74282627369.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/23j866ua2dbvudscs9u89eq2u4/20418042987.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/2e6ed96a35b349714f92d9d233afbfa6/91931868071.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0090d58bb4---vibobixubomeru.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708a98605dd---xebixav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=canon+30+d+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11133 2268 bytes
SHA-256: acb4b4b25e50f7685ecd78cd215bef76039b8c36bf651eaf5c5b48906fb6dad2
font_01_sfnt_off00011b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1A 19988 bytes
SHA-256: 61fbdd23aa2892a30c7286743b48b84032e6ede9d130093cac1b9448c6ed1af8
font_02_sfnt_off00014dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000165d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165D7 10244 bytes
SHA-256: f17f8a787c3f524d51fbb83e22434078db13b0fcd3590a99f9680f5c7059c77c

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