Malicious PDF — malware analysis report

Static analysis result for SHA-256 649b41302cc4f18c…

MALICIOUS

PDF

83.9 KB Created: 2021-07-02 10:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5d1dc3eecc48d9d46e3ef50a26906b7a SHA-1: ebf7b73654ff5df8d9aeff9eedcc7c11bb570213 SHA-256: 649b41302cc4f18cfb648daa28c568172ef953f0c7cf908628a4472be5aa1f1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=positive+ovulation+test PDF link annotation
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2567f346804cd8c329b873b234d3fd26/95052849784.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/40640064393.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/34472017910.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/rscpk8kp187fctjvpqjea5kqmi/lafupojikitid.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/bajokomizafezitesinujeris.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2ff9d811b---zixewugiketisereseza.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a66ed67d562---9480370452.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/88397458521.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/78336256538.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/26411467839.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///tojasunimoberab.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/musilulidupe.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160aa98f4073e6---93821291159.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/knl95nuqfkm1rf3taacu4d85gd/36409386640.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/80563233372.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d6276f574---46797234542.pdfIn PDF document text
    • http://slsnn.ru/content/file/jesuwigubalovog.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/7f4fe4e3c4e8a08a69a55cb4d6b270c4/bagikemowenazivapu.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcf28536a8---jifekimur.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/ed8q36nupqbqlh1kca1cvit4r1/ligipobuzig.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/69123661849.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160991c83676df---63363698350.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b999aa21001---pawurafumasibazonizajage.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/23451050539.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/0de40b5d85e9af36e16e981d8b99f448/suzalididuxopewi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77B 16948 bytes
SHA-256: 8c5b4ec2cc628fbd5a1d3e7e4e39670ba71383d262ab14f7d25d5afd16f8c9cd
font_01_sfnt_off00011368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11368 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7F 10168 bytes
SHA-256: 0dda9534e7faab1cc30ea4792dc3c87a4e7b767a682dfe131fac0f4d1012c81c

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