Malicious PDF — malware analysis report

Static analysis result for SHA-256 381049ba5b44c4b7…

MALICIOUS

PDF

94.9 KB Created: 2021-07-29 19:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e875fc455aed3e6eb93ae5e026425f61 SHA-1: c083bdf3736031dd24fdb34ad087fdbe29cd84ed SHA-256: 381049ba5b44c4b7d9d483387fc175aacd00ca0a6b7a268738ff88550e96971d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised or disposable hosting sites, which is a common tactic for phishing or distributing further malware. The presence of numerous unknown URLs associated with compromised CMS uploads and disposable hosting strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://terracetemayonetim.com/upload/ckfinder/files/95015528307.pdf In PDF document text
    • http://abnicum.com/files/file/93337161569.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/povavusuvep.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/wefexurududelatek.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/68266349729.pdfIn PDF document text
    • http://chromavials.com/d/files/63340684255.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc614d15019---tagajovukivarusepamofoxo.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/543168a8451056149b3f574c4336ec58/kularonepu.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f7644d4972c---54672178748.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1082a32f5f---12723866404.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160731ee0873be---kasetoj.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b839d9cde70---divisupozikiperatida.pdfIn PDF document text
    • http://www.77ice.com/upload/files/99498920662.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/mutugitubitutis.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2872f16c7---77579988134.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210610072845.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ece94a4df426513a7dc06b076e217d61/11174683609.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/bijanuserof.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/18509854104.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/jasegop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=is+jll+a+good+place+to+workPDF 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_off000109ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109ED 10752 bytes
SHA-256: 42aef59122f7230fd1cf13d0f486a00fb61b58b5b932a1b2a593206bce9540e6
font_01_sfnt_off000122b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B1 19044 bytes
SHA-256: 0202e67a4ade06ac217db55125240f6117e0ce895e3e5149b2a05f49abbc4ac0
font_02_sfnt_off00015384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15384 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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