Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bbcd99046bfb74b…

MALICIOUS

PDF

88.9 KB Created: 2021-07-31 05:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e8a8895ec50056e949c43928924ba80a SHA-1: 3060cf0b0591b9ffe18f16c19b27c86f7f67e600 SHA-256: 7bbcd99046bfb74b22714bab95091ab237acec0c418bde8ac32963e9456256cd
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads or disposable domains. The embedded URLs, such as http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff73b4d1ad3---55884087362.pdf, are likely intended to host malicious content or facilitate phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://lahma.pl/_u/userfiles/file/14871372988.pdf In PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9996b2369e---8180314956.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/kexubanu.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077184bb81ab---88848720621.pdfIn PDF document text
    • https://masukpt1.com/contents//files/61661013326.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/desawugakijokawipovopatex.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/3fdf36064d22e12400aa684ae82f6cc5/bezit.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4298166aba---10487469844.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/dodobimumezagabafudeturo.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/4e61192e45fca4a7e5702df22238b77e/favoza.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/padisewem.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d0b0d774a---bawetewuginaxozokumamumol.pdfIn PDF document text
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/72475793554.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608431c8ae195---gixeraxerofekepelefe.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/36829994539.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/90583579176.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/69913357868.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/94364362318.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/denakomaz.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/jesek.pdfIn PDF document text
    • http://righetti1970.com/clients/872956/File/72741848039.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/8936846709.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff73b4d1ad3---55884087362.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/8716119006.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/4rurkidhrna5tq2hjbi090l29d/pudujaboxexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+do+i+get+my+dog+certified+as+a+service+animalPDF 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_off0000f5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FD 11076 bytes
SHA-256: 725949a58ceda0e2a4f3307c2c1231fdb027b6c5c0013e8eb59060dbe9903cf3
font_01_sfnt_off00010fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B2 17324 bytes
SHA-256: d09797f4d59cbd07aa80fe1900b17d7d25e60f19acd64ce945ef6e2e560adba3