Malicious PDF — malware analysis report

Static analysis result for SHA-256 939e3aa582ff5ab7…

MALICIOUS

PDF

86.3 KB Created: 2021-08-12 19:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 31e22f4dca72d915f792314b6365a057 SHA-1: 64733acdc5b85092078aec4bfcdc89723fe9d0af SHA-256: 939e3aa582ff5ab7eaeb6f887100485dccfa4fba3ec610ee75ad38d3636d127e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://jobtiara.com/files/files/repeguzirinikemuvaf.pdf In PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/6afu9h8lcbhbmujq13l3m57or7/safavotadipe.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/mafiro.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d856b71b4---2148469949.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/1546618147.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160fe57b56c51d---puvanizoxazugebozulogig.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/suziropibitarebasibumobi.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084855d430bf---48823545979.pdfIn PDF document text
    • http://df-2.de/images/daten/file/70469510306.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/kubax.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/40803229417.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/54229399137.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/sonexajekimomemefunuxuda.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/3331288b2e89c34a444a9d53a5b6feba/selefodukaxeselim.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/26850415515.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/d4a0093f2c0615489f1cd11f90baac13/13895629005.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/09aee17dbce856c008847417af838d82/93753350140.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790272368a6---81833207239.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/rutokeligulitegoxeroxidet.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/wurakazibekugozudebo.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f43a57b5e0---kagewipuwebiligiwoduwogi.pdfIn PDF document text
    • http://dejede.com/userfiles/file/30669964768.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/72198493937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ejercicios+de+ley+de+los+signos+multiplicaci%C3%B3n+y+divisi%C3%B3nPDF 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_off0000ec2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2D 11388 bytes
SHA-256: 19605fd7cb58a0fa8f530ab9a6def80da022cbc41b1dce4e41d86a89ebc7b02f
font_01_sfnt_off0001068c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9E 16768 bytes
SHA-256: bc824ba64bb2bdb2c77f6ee009cb4e20ea6a40202ef736592a65a3e667445960

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