Malicious PDF — malware analysis report

Static analysis result for SHA-256 e189c697d8dc1180…

MALICIOUS

PDF

83.6 KB Created: 2021-09-15 23:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc7b35edd0450d8c80b5838fec8dbc74 SHA-1: b50fef07ea97e41c50a31073ab23fec34ca56223 SHA-256: e189c697d8dc11807be409b5e0810cb142b67d7f4faa0efe62581fe9445b014d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL distribution point towards an attempt to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=fountainhead+telugu+pdf PDF link annotation
    • http://www.painters-restaurant.com/userfiles/file/bivoxuzupovesepabasi.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/kidipupoxekuso.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/26567418165.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/raturevegabazo.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/35329326459.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/dabaxeru.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b82c5c5e13be417e4582fd45822afe55/31145633910.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/fenetunamuzit.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/63510073527.pdfIn PDF document text
    • http://thevale.us/userimages/nobiw.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/66260024274.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/85809074699.pdfIn PDF document text
    • http://checopharma.com/upload/files/9592224102.pdfIn PDF document text
    • https://mfdesign.hu/files/file/ginadavuxidivom.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/82849989896.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/24915317139.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/gutitabubu.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/55592280a3eb925ecd02b6c053183ea5/81404459393.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/66593667339.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/4210d43f84f383ed8098119db3efb5dc/13010721436.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7a91eafcb---21405906808.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109081509132415.pdfIn PDF document text
    • http://pvvc.cz/files/vofavawixojawusorewurita.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/jiruxi.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/23900107210.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/gidurogafigawoga.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_off0000c3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B2 16192 bytes
SHA-256: 126aabc53b187bc4421529373f04e2f66a11804dfeaeb35cb650b132d56c1dbd
font_01_sfnt_off0000d958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD958 21620 bytes
SHA-256: 9c6098667f9bf59475c8655564bdbc6f939bc569b260bc866f93d28e14114a5e
font_02_sfnt_off0001101d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101D 10588 bytes
SHA-256: 36353462a20c2486e0e05f26ecb50250ee7f2e985aadc7c294c6504ad53df4dc
font_03_sfnt_off000127f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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