Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe8943916179796…

MALICIOUS

PDF

91.4 KB Created: 2021-07-30 08:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b6a1662fb5f6f2f1099b3e04a2ed11b SHA-1: f8aa58c13658d4994304178b820ea0dcc342e6ea SHA-256: 4fe8943916179796a206d357eabdf983cd72ce694cc5ef99f337ae94c3149241
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/utslno0vhrb7vn2gti2etsdgm0/wuvojubitanuwuzemukapoxak.pdf In PDF document text
    • http://bygreenpure.com/userfiles/file/zereva.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2c250ce6b---462690591.pdfIn PDF document text
    • https://manenshop.com/upload/files/wedigorutami.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160929064c8bd2---5041828397.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/7777717951.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a912d2a9eaf0d0feca2055d1e964a2ab/50105089785.pdfIn PDF document text
    • https://churchboys.org/userfiles/files/makolazi.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5b038fd84---pokatun.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608827666c50f---71491200560.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/fagajakisupopalibajufij.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/66793385069.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/55103793852.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/8591fbf513b3ba7149e637f05b0cf0c9/36995356475.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/zoretamuzil.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/90214e7348c617610af8b789bf72fb74/kisevesode.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-5/20210505123100163897.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc9c31bde4---96680630882.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ke8e2t32rkp59638vh21o66ps5/sorovitutipaki.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/53680412305.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/77641473813.pdfIn PDF document text
    • https://tepihtrava.rs//files/subufaxukakosinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+copy+and+paste+multiple+times+in+sketchupPDF 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_off0000ff88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF88 11064 bytes
SHA-256: 501e0018ab43a27a668a69b53ad791003feb9a426ee069d60c7582106dac88b5
font_01_sfnt_off0001191c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191C 17468 bytes
SHA-256: ea356662ad4106bf2bcd27de7d3812b5481a8a1cbb50c099967b5fb7ef526359
font_02_sfnt_off000146ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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