Malicious PDF — malware analysis report

Static analysis result for SHA-256 07cff7c81bcd21e2…

MALICIOUS

PDF

79.6 KB Created: 2021-09-04 14:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 52eaead5bb6210c04b518f837edf4a17 SHA-1: e66a968914fc122d2a7cd138e687f499d8e7b8d4 SHA-256: 07cff7c81bcd21e271d97df3451dc2f89df27a197dcd8cacd0612ed1ab636151
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to potentially compromised or disposable hosting, suggesting a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it may exploit PDF vulnerabilities or redirect users to malicious sites, possibly via embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc72200f1---dexabalevinusunoku.pdf In PDF document text
    • https://brickbodysupplements.com/newerac2c/userfiles/file/23296438738.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/10983432165.pdfIn PDF document text
    • https://menu2uplus.com/images/file/91465151681.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/levufedaf.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91c0bf0d4---bewotadoka.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/39540998989.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/20683223363.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/76239563603.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0af55e531---14772945243.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/24728293783.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/majikareponirodero.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb7c2658cc---kimelujo.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/20502615933.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/82468336770.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/79402228848.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/45886190602.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/dikosefatixonuv.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210804_6A75F3A21B8E1D47.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/a1beb542fa79a118bfd96d4c9323335d/46188785316.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/e0da04f46e7329c51f12ba1867169541/jugagavakidadezeg.pdfIn PDF document text
    • http://195exim.com/datas/files/xiputufib.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/34641394030.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/nirofetedavavowikapuju.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/87d705e14819f8d8b484c5effe395413/25224624635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=modular+arithmetic+cryptography+pdfPDF 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_off0000d0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A1 11000 bytes
SHA-256: 23048e76d2cf9fb5a832f026427f5e7f9c60c9b8b3dbb7ddf92a1faa3da58ea4
font_01_sfnt_off0000e9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FA 17912 bytes
SHA-256: 92a4dc3e3678784b430b6df3f5070b2d968c6365f389f31244749bf9f9b785f7
font_02_sfnt_off00011908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1