Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bac44694f0b0395…

MALICIOUS

PDF

84.9 KB Created: 2021-07-14 07:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f4de570f600872c86926f89b35d4b5e5 SHA-1: e050cbf2dbcf45f03bcdde7ba00632eb04589af3 SHA-256: 4bac44694f0b03955418a635b0e19c6e914a819e8291c43e47d2152a5f5504d8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute phishing content or malware. The PDF's structure and the presence of many external links strongly suggest it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://silesiacapital.eu/data/file/jobepiwelofomuvuf.pdf In PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/62ec7b4cdcd901b04da20c9a86687864/palebexazepurefe.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/6184150397.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607860c9b53f2---keganipadulala.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/komixigemebijiz.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/kuzunox.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/db0144a3142220ff88b7e432fe47a1b4/16377419633.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/7199876164783f37b383989ab9166def/55937610485.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/loribugugijamujulimubudir.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/5jmpo7t6qm5t4ou18m25sifshf/54021711903.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/mofenosuze.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e184737f1---18475696158.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/d97593d17ac63abd831ff19bf82f0b98/31329596414.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/85165008018.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecc6a06d548---3712665306.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/zebevefifisemiguru.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdca0e5b0d---mefitun.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/diwufafoxevolewevemutupok.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/78620212568.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/jedukatumujofikifipifije.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/97495314490.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/2f2f8d0919c83f16cfc93e5ff361ee71/66033788009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=importance+of+communication+in+organization+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_off0000ec7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 10860 bytes
SHA-256: 51362809870dde9617f8269f2436fe0f472e8cc484706bab7b039b63ef0d06b4
font_01_sfnt_off00010559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10559 15964 bytes
SHA-256: 907ebd8cc63f86cfaeed7f4302c965f54b6def3fad929debea55340db0e25299
font_02_sfnt_off00012e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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