Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef270b227b0b224…

MALICIOUS

PDF

85.9 KB Created: 2021-09-05 04:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c2aff40165186ae6efd38e668d8459b7 SHA-1: eb08814c33b4bccbef118806d19c91826fa61e20 SHA-256: fef270b227b0b224b8d630baa1411ac3219aa5b8ae61df5fcf5ffd9b1685ebfa
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to lure users through search engine optimization or phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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 https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d442cd576---jewikuzukej.pdf In PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160755ed8495c0---vukeletid.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/2410357638.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/18392916356.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfe652c463---10722193636.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160bff3224bf52---17720213585.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/16acebdeb8ed87cabc5a1f5b0543de76/dawofujogoruravarutopo.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89869c7423---vejivenizopotoxuwoxevupen.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/jejovida.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb90ca055c---xaliwumopuxutevikow.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210522164536.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/17903794287.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/kogaboxakevamo.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e1fa590e859---gavitugewopejikarokeni.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0bt3cnkh5vhpvr7h4feo684rgi/13549972976.pdfIn PDF document text
    • https://vv-alc.nl/uploads/files/bobebiranawibaxexalope.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/megebetufiva.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ca459667e---dikaj.pdfIn PDF document text
    • http://myslizdrave.com/soubory/kamobul.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/12128576445.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714ae8cc12e---xakebetijenurul.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/80637179001.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/0b71545b014a7572ec4ed4be7f7dde3a/wikotobuzibufejodoxut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=rutina+de+ejercicios+en+casa+pdfPDF 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_off0000e95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95C 19108 bytes
SHA-256: 3e5580d62c140b811aa18acc0b27936771e607065eff295b82e90422aefad3b8
font_01_sfnt_off00011939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11939 10840 bytes
SHA-256: 90d429027a4cfd900836b0edc596421bc5abba66dd8762f13655ef2bb5835ec6
font_02_sfnt_off00013256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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