Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d9507e966dda8b…

MALICIOUS

PDF

84.0 KB Created: 2021-09-03 05:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b98711f9c351735238b6c68c585dd11e SHA-1: e90bf8be2376252d4822fab748cd486bd08009ce SHA-256: f8d9507e966dda8b5adf7b561eb5a91f14824521f81369c2c0e3e3652aaf13e2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are identified as compromised CMS uploads or disposable hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive, which is then expected to be password-protected. This is a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://omak1968.com/clients/71178/File/mawofodimadetumopana.pdf In PDF document text
    • http://domholidays.com/userfiles/file/jinozugekosuvawixogovi.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc31c7e683---80132210752.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611034e05f975---76332571118.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316978b237a---gibadufafaxakujerixazu.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc6811e0f7---85944778073.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/wimelokotatigunoro.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/12763174740.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/47566453142.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/zafibuxadekuxamokusu.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/a535f6fe34451ade08a37e69eb4884ea/90465957983.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/nutexepebisegidasisij.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/21nok2ahuv9d8go7vsid9bdibl/77337744282.pdfIn PDF document text
    • https://granchefpremiumfood.it/file/4469959320.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/fofabosilefubobizaveveti.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/zisur.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/a8vs0geghod3hpsl0vr2q6j762/pumadoxenerexux.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/koripedixamuxajem.pdfIn PDF document text
    • http://aprt1day.ru/file/sokudadegivavam.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/06/file/20210606_150316_188.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/repenoxidonaxatasetulewus.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/najelobafu.pdfIn PDF document text
    • http://jucal.es/images/file/44057235850.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e662310b1---77101022044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ibm+ilog+cplex+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD58 19684 bytes
SHA-256: dd32c1c650b41aee426d6d2f676e357ceedec29064e4eacca10c65bfb7a8525e
font_01_sfnt_off000110ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AE 10644 bytes
SHA-256: 9c81b18fd0b104d96683f7c44ee8a7b217fc0f7f029bfcc4868734d593c655fe
font_02_sfnt_off000128c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1