Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a6e58a4d09f1a14…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 09:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5870171ca133be8300a546ac6d28b877 SHA-1: 3bde762226f3c985ba11b66038c1cf4b8d1f210e SHA-256: 0a6e58a4d09f1a149a872f39b3a4d537f1cb78e79f268f11c5ba290903f16e07
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_URGENCY_LURE' further supports the phishing pretext, indicating the document likely contains urgent language to prompt user interaction with the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ijdssymposium.eu/upload/lamef.pdf In PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608509c253d69---magutevelisu.pdfIn PDF document text
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/jagunopukiwasolebetu.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/xemegerebefofokaxikorok.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/27633841196.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/13116026843.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/4f3f8540d485b55cbd0341d0166b8571/wosuvigaberuxal.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/5275198ab6a778de4c22932466d5b6ed/dazafonijurilebojixo.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/fepuxodawazoj.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/33653041031.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/5354504767.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/wuwatididetalafikofi.pdfIn PDF document text
    • http://heizler.hu/files/file/basowodoj.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/d2ovqcl9vrvd3cgo4iv02giomj/relur.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/safizoxevuv.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/2eaed1a2db28208356a2d196c045758c/dakabu.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4357066681---wugapo.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612acaa9453d4---99891615079.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/46325748075.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f431a40f0---81112166884.pdfIn PDF document text
    • https://abeess.com/userfiles/file/kapuzasebudivijavadawu.pdfIn PDF document text
    • http://www.centralperdana.com/file/banunemowi.pdfIn PDF document text
    • https://reha.bg/content/upload/file/42874572623.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/68529812732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=thank+you+letter+for+leaving+the+companyPDF 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_off0000e284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE284 16744 bytes
SHA-256: 67bbafe3b3de343c5cf59f7d4aaa44de34024e8f55f04047bbf216e84d5c0c49
font_01_sfnt_off00010d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6F 11092 bytes
SHA-256: 46dfa6d94c6d9f42e4d7a1b91b20cf91214f02b8351a2a01e050bfd56e6e631f
font_02_sfnt_off0001272c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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