Malicious PDF — malware analysis report

Static analysis result for SHA-256 d756aa175c539e46…

MALICIOUS

PDF

108.8 KB Created: 2021-09-05 04:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 73d751bc4a2ea22089afb918741c2107 SHA-1: c9c56c53eee0299f4c9f0929127ff167a6545bd5 SHA-256: d756aa175c539e463e2a5b01af6a1f1c0664ddf23542ee7ef79a73950226e8c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm indicators strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://infrive.ru/uplcv?utm_term=a+court+of+mist+and+fury+chapter+55+pdf PDF link annotation
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/91230996071.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ed5a81dfd---fewiwudanu.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/50823632049.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ad2a295ad---78814171941.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/zizinazisejabimaxuduniwi.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0826/a0a63d739d3b413959c2067373b6d006.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/igrroj3viqr62a5rg97b0g5l19/28890415242.pdfIn PDF document text
    • https://sitarasign.ir/data/file/vunubagovulo.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/9ev43kumg042bbc5bvur3hvrt2/lotufasizufego.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/14585487469.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d844ee7e4---39898143621.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54ddc28cd---kizijivelovasil.pdfIn PDF document text
    • http://ccadl.com/files/20210722194644.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/dusoretizeregi.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/13803416883.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/14302500000.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/58860088741.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/29458545379.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/32810898054.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/64809363391.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/idecpho6r1eob267hpj2gc6abq/vepimataleriti.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/lukuvumove.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/14924640979.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/4222668025.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/811ae67d92f4f20bc08a0ec5a01eb3d1/916981520.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_off0001418a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1418A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001599c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1599C 19228 bytes
SHA-256: 80769f5b91613c4e89aac112d2fc07f5fa1b0de95d50098d3a0cc34550767294
font_02_sfnt_off00018b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B0B 11168 bytes
SHA-256: 4ac45f000afb8cfe8b1285163b5697d5ece2cf8505aed5d4f5727d046418910d

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