Malicious PDF — malware analysis report

Static analysis result for SHA-256 12745fed941a7807…

MALICIOUS

PDF

107.3 KB Created: 2021-07-07 13:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0f6a35f9463e6e20f7b63fd295ff26f8 SHA-1: 3f5fc2815c42d744cc5f95495e767fe328df85be SHA-256: 12745fed941a78076d5728e929c408c00a0418ac1463a7681e7ea5ea808704e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting domains. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to redirect users to potentially malicious content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://ylplj.com/ckfinder/userfiles/files/bobakuwod.pdf In PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddb06c677f---91587201830.pdfIn PDF document text
    • https://htapigroup3.com/contents//files/31388565219.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/773bca14qu9aotd2hs6rk653d7/3917168212.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/fagirimewuvaxiduzob.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/wexakex.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/57140081220.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/mupubegolafiwobozek.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/31253658233.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba7bb6eb5a---pavabawodedapupotow.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/a1grfen3vi1ogmal8s8squhe9j/3330970566.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/98950504066.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/56499219898.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/rugazuvivekotogifo.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa1de873ce---fimemozonudetupiguvupigoj.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/2806829512.pdfIn PDF document text
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/ed30e95e162da7efe94ee1dfecec2146/telewu.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/759037461ac1fba1f77fb7be5127bcda/48128553991.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6db1c58de---11747269295.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/piseji.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160afa6756f632---zofife.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/18681218336.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701489e5cb9---ladofanasipugamajawiwugi.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f30de5676---vakoxuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+find+all+the+zerosPDF 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_off00013e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E03 18756 bytes
SHA-256: 87ad6e017aca464535efed20efd7929b4fb5eec840bdcc7f309d0cdb2e17c3bd
font_01_sfnt_off00016fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000187e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187E6 10588 bytes
SHA-256: 7fd0ea6143109dc32e8875c2e7da55ed44a39a19cef9fa1293f01d14613e5f5e