Malicious PDF — malware analysis report

Static analysis result for SHA-256 5240f9f521a08e21…

MALICIOUS

PDF

97.7 KB Created: 2021-09-08 03:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e7df7d3d592e4f1dcdac39ffd0fa8214 SHA-1: 155b31c40af97b1c65cd268d18ad912f73dd94af SHA-256: 5240f9f521a08e217f62ab36a5ea1ba7f9fd8d05f440569a3d77f0eb0cbc0100
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://telekommarketing.com/firme_data/files/29182634462.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be777bf1d52---ruzonogegonuponudop.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/kelaroto.pdfIn PDF document text
    • http://sun-tes.ru/files/file/kogofebuxa.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/86bb46cfe0d956a55959cd5f4b7a4b84/51002435128.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/41763430271.pdfIn PDF document text
    • http://buchtel1967.com/clients/26382/File/14731836232.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/wiseguzugu.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/fidinegoxa.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7bc69a98507f482c2c9566d34ebe2ca8/11208253840.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/31380981374.pdfIn PDF document text
    • https://xigmatek.com/upload/files/dafoxegefigerisik.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/99548632069.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/76450176581.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/muzazijelabumomuzi.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/ligafifowobo.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/mejidudivujisanukenefunat.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/blj2nofuf30l2kiv18te8q33e7/54883958467.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/13096460816.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/c4a15de12418cbd6893b8fb5b4881c0f/memimupag.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/lofopi.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/92f1cfa0c791d7a791c751f110e578bc/revujeludijofadefumujo.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/pujuvavajesale.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/btdi1dhfi8j0un9eanvu7aiaik/pazogatutapilome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=puerperium+adalah+pdfPDF link annotation
    • http://janyska.home.pl/_mjanyska2013/fotki/file/70039055351.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_off000119e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000131f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F7 18352 bytes
SHA-256: 82e16f69f46572ecc1d9945d8293c8d654f6da99403db765ffa2fafd8e6befad
font_02_sfnt_off000161e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161E4 10376 bytes
SHA-256: 2627b625328bfda7937e7d9ac72121f933faa64c64ef214b1e310fcc4c31c100