Malicious PDF — malware analysis report

Static analysis result for SHA-256 36bf43e8ad1da1c0…

MALICIOUS

PDF

98.6 KB Created: 2021-06-25 23:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb2cd17ca17c55852dfc8db1e217494f SHA-1: 0cc058a31032bcf3271ef2403cf988fa6fe9a71e SHA-256: 36bf43e8ad1da1c0aecdddaaab0cd407350fd20fcc086f451b72979349a1b9be
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to compromised WordPress sites or raw IP addresses, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff88c17541---tirolozizulogoradusateg.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82f8c9d42d---tuviribosoradazoba.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906f2554179---ridipavojapifokefadilu.pdf
    • http://zonweringnederland.com/ckfinder/userfiles/files/ganedi.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/f4e8e6213ab8cfe8e4ac3b74fb605729/miberitalamesuniruzelug.pdf
    • http://ubest.ru/images/file/81732328923.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/9fa5a5f78bf2d2ba31f4a8980b10f7cc/bajunowipixotozuzeb.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/2e31069bf2aea77d8964ebc55fd61ea9/nuzisumemomuwug.pdf
    • https://braintreeclinics.com/app/webroot/img/files/fexumulogadawo.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071fce46e5d8---664966106.pdf
    • https://comobrew.com/newsite/images/user_uploads/file/jokaxewex.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082fe5261ac4---11291608819.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160931c22f0403---vabuxarusodor.pdf
    • https://tavcam.com/upload/ckfinder/files/54983133012.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097fc5dcab13---63259121948.pdf
    • https://hunde-katzen.at/soubory/teremobakejotot.pdf
    • http://stlnsk.ru/uploads/file/vapefitibalipili.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2299356a9---86561000165.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/7jees3rbt4dipdv2ajggofknae/25007960338.pdf
    • https://qqhanoman.com/contents//files/47093942558.pdf
    • https://detskeihriska.eu/ckfinder/userfiles/files/dekutixekaf.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16088d3eacf635---pozibitugifo.pdf
    • http://157.230.241.115/image/upload/File/21108482752.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=nat+geo+fios+channel
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff68.bin
fdc3f250e16d4eeaac0151c08e1678493ac6cc67090af3137bc700c4cd553891
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF68 16348 bytes
font_01_sfnt_off000115bb.bin
405dee1ccde0ad24223311ece697199eb2a0f7bb32b65a1081ac84af451df899
pdf-font-stream PDF embedded font (sfnt) at offset 0x115BB 21516 bytes
font_02_sfnt_off00014cb8.bin
7f533d3563a55be0497c0a14a209e94d43fde172c143e4b8d77232dbc78e698f
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB8 10492 bytes
font_03_sfnt_off00016485.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16485 16792 bytes