Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a37c3101b2b0720…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 16:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3c034978eab0ac6782413d7702a32cae SHA-1: ba6b61a6e3108182d5ff08993b51a2774ee04289 SHA-256: 1a37c3101b2b0720445e7dc6e4032419a1f0d0473561b7819ac6d5008a65b9ff
196 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, several of which are hosted on compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://vinhthuanvietnam.com/upload/files/repapasozogut.pdf In PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/oal0o7fjcdud8ul9jh77rlvvg4/14199872169.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/kafen.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/lavim.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/38369424069.pdfIn PDF document text
    • http://abpaluso.com/upload/file/92346089910.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/babaxonirimuxedewitome.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/g8juveu2p5ra4k4t0h86m2ol07/zuwegukaxabaginenenasa.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/47326208557.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/99778717446.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/48484922500.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/85232509197.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/16412290972.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/6520288958.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/31691955302.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161323eb7283f7---namisinaxogonevexagef.pdfIn PDF document text
    • http://riversedgefm.com/files/file/31645060508.pdfIn PDF document text
    • http://twilaw.com/files/files/72648226945.pdfIn PDF document text
    • http://runhouchem.com/upload/files/mejego.pdfIn PDF document text
    • http://belean.pl/userfiles/file/94069373126.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/sudakirufapuzeleli.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/tosovo.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16142874cdc89d---23906519796.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/fumiwewugivivukorivux.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/45260821977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=what+is+wireless+lanPDF 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_off0000d9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FA 10164 bytes
SHA-256: 90d230289a15ef21e8e5bba5a57b7b5b2dfbd5353bf7ae446addb8888147bc33
font_01_sfnt_off0000f0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B1 18252 bytes
SHA-256: d6253a4fae75da6409c4826fc276c4c08683da8a377e71c215ee3a20f98f1cb9
font_02_sfnt_off00012024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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