Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7db845e0b271c83…

MALICIOUS

PDF

74.6 KB Created: 2021-09-04 21:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 01f8402c3ba51dc47980b65280acdc1d SHA-1: a3aca0d5141b948c15df60c7475f066d44feae53 SHA-256: e7db845e0b271c8354adfa3a5af30de283c6bd3be9d70ecdca3bca6e8f9a8754
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/9i2dts7mcjgvd6pr8mkiihq4c9/95028442676.pdf In PDF document text
    • http://wenxuezj.com/images/File/32738552575.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/tunarunedinuken.pdfIn PDF document text
    • http://jinohair.com/upload/files/93085329696.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/24621816067.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a82b7f72f---42275250706.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/goposovojejuzajam.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/15684528483.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d4973b75d---97086159206.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/69412784796.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/90613993615.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/64673935252.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/subev.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c071be67c---panuwi.pdfIn PDF document text
    • http://voijin.com/userfiles/files/firegisigonujofejivowunef.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/583d13bda025b06c93220153d7459d15/83392250354.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/74185691680.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c612b3aff06---rupibatavilure.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/1c7b4aeb55e6e7fa5b3e1693b202e154/zanopovak.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/66960199530.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69753c9c25---8114314714.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/duduzigenomafunepuma.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/sizul.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/warowedalolewunarorepot.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/ac5c5651e5c6393423ab71404b9b2de0/38944144033.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/3c1c3ae36476abc3fbda274f038d622a/mekodoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=2000+jeep+tj+manual+transmission+fluidPDF 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_off0000bde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE8 14852 bytes
SHA-256: c5046f316e450e158e5f91cb67c03296db6104ae9c880b78414d516b4ac3daca
font_01_sfnt_off0000e399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE399 13380 bytes
SHA-256: 8512f0fcaefe164bda809f928b855722d1dc09ea52cb1a7bd6be1bc77e6b627e
font_02_sfnt_off0001044f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1