Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c157433c87b0af3…

MALICIOUS

PDF

85.0 KB Created: 2021-07-19 16:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 50999451b4f5fa543662d04b151f6f63 SHA-1: e0a0a127f74b988515b6eadce0c07b2bdd131992 SHA-256: 5c157433c87b0af3f4349edc975320dfcbc08547717bc41980ccd9c2ce27470d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were directly extracted, the nature of the embedded links and the detection signatures indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.pattyn360.com/upload/forum/files/53066796173.pdf In PDF document text
    • http://abwmarlboropike.com/uploads/files/1743570305.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8ab49a394---51383815664.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/cc7bb83a3cbc79bc56b11d47021dd625/28163805697.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/fifudi.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/zenatemeluremowejafazasif.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/78155331057.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/opgu0c4jic2e3gn12bnomc6da3/tazamevoxosilobajima.pdfIn PDF document text
    • http://artospace.com/pics/file/dusikuwifi.pdfIn PDF document text
    • http://sharise.net/Uploadfiles/files/jasexenokuv.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210605180251.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c569bf0f241---romudijesanut.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f09de97782---malapesizuvebapuwug.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/mewasowuvewotigetemosur.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/tizaxel.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/57497280469.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/016cbb7fb4bf03a1523497e4382e07c7/54625234872.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607659bbccf82---vubuguz.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a048705c13b---nuvebunisubanozeso.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/18946059888.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hj3ab6huv1sppkbd9cjnbggf82/84785390312.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/21173141653.pdfIn PDF document text
    • https://menu2uplus.com/images/file/96624293175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=fastest+time+at+belmont+stakesPDF 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_off0000e9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D5 17412 bytes
SHA-256: f038131ce1a0207b4ea0e3163d39481786be0023cd387b8e6e6b6d354c216ae4
font_01_sfnt_off0001177b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F92 10380 bytes
SHA-256: 2f4124f58988700a05f78e84304c859177203b46709f34a1c40611419c09815c

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