Malicious PDF — malware analysis report

Static analysis result for SHA-256 f318919cf2620133…

MALICIOUS

PDF

97.5 KB Created: 2021-06-28 03:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3839c497d904d7c4b04bbc807e79ef64 SHA-1: 8ca90aa946d20199df40dbc33ddf550dcf573f17 SHA-256: f318919cf2620133f7139c7fc271faab9cf7f98f43d27c99fd9c4be2fc717362
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to compromised websites or phishing pages. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://infrive.ru/uplcv?utm_term=warframe+single+player+missions PDF link annotation
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/7dd4a00de798cfa3c6bbfda3619faabd/guzoxifimofuxenalawelogev.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/luwuvuxijalezudiwewej.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d37736a18a7---juvizisasufale.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/zidenenitudekum.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc153d1273---nikimubusipolazifaj.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/nurojivupanomukuriniserir.pdfIn PDF document text
    • http://haus-st-otmar.ch/userfiles/files/sudurujimafen.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607889b563a1b---ginoteposoxutud.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/b8d6e2953a766b70e5eeb0fa73b7cfe2/mizape.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/kubukonirafaworunolox.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607da6c375dd5---44355263882.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/5942995269.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/9fd1c73a582d4c769c827176d67af5b1/kepogufesalujigukotosu.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3b52170f6---burejevodavorove.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088fff1a6fb3---beziboti.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/31c64f68d6f894faa35e4f2c2cf12b2e/pagulux.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/20550456198.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/39488853247.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf83e5aaef8---78118295676.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f22897ca2e---11552603681.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/99561904516.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/tujoluxopizufulafi.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608536cb82ae0---razijinotafaxezev.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E9 19124 bytes
SHA-256: 33922b8daf576db8ff7685b5d60760ef1f2443bdbeee7f86991bb554ba12ada1
font_01_sfnt_off000131f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A04 16192 bytes
SHA-256: 97e3f73a58ccdd4784c9ae1678d9f90717e6b6d0c87c36bf93adb8865ef65ebd
font_03_sfnt_off00015f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F91 10712 bytes
SHA-256: b6bf2d0c7739843a2b64ba115e89c72553ffcbbb82e7e2636022fa366ba7ea6b

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