Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc654de187bcf92…

MALICIOUS

PDF

82.1 KB Created: 2021-06-26 02:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 833bba6b3278a75edc3c523168a1c067 SHA-1: ce4a50e62d8a5224e88869ffb3a6f95fbd12a30c SHA-256: 1bc654de187bcf92bef6223aae1ee0a5b41902d6f4bcd67179ac2bf874148465
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malware or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/r8o88pl481fmsth773b6fosoq4/93820169116.pdf
    • http://jtour.vn/userfiles/file/suxoguguvufutidofila.pdf
    • http://studioarchperissinotto.eu/userfiles/files/63038771724.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609331980eaa4---62947417106.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/7199876164783f37b383989ab9166def/55937610485.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0hdjjv0li8bh59i58ta4j2ihe1/gesutafimiximosu.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1f3a6a72a---tuzipumumuf.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/592ba009f88fcb2cd290f917b951e00e/julawog.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/8eeb117be68189db2b719582baef9aa1/wegubilidosekalegowipuku.pdf
    • https://burlingame.com/wysiwygfiles/file/kumagutup.pdf
    • http://eska-lift.ru/userfiles/file/dibejagujibumexow.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce70e15589---ronixunugitufosupil.pdf
    • https://tavio.ru/files/file/madujud.pdf
    • http://thuexe7cho.vn/upload/files/65660092933.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e08ebc69f---gujitogusarutawerurikirul.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05074f294c---43651981902.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/omc7fkngedv42c1qq3gqg3fj87/siguxufides.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/17ac837bcb5c03c43f866f21d0c8ba0d/romawebu.pdf
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/684f4da8cae5dd96f6acff4594f35659/xuwaxasaduvivulerufenovoz.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ecbaf278010a348ca1165ff2180bb3d8/nafemopujejirubotopur.pdf
    • https://europawindow.com/app/webroot/img/main_content/files/30553338779.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b3b647cd9---47132996743.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/8jicv2ofmrp2pjugqmkseqtpf9/sezininu.pdf
    • http://akbarestate.com/survey/userfiles/files/fujenuloxamubotixamuke.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/b9cc88bb138854de8b6d713889c0c857/dakopatipuwa.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/0aef42c51066d7be04c72cec75b81d79/xibatajubevak.pdf
    • http://hattingtoemrerogsnedker.dk/userfiles/file/48677440733.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=when+the+trumpet+of+the+lord
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd1e.bin
102c0e6616f2e2e31436733f0c263e6c6f85ce5fdb03cee38db7dd311b4d3ef0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1E 17512 bytes
font_01_sfnt_off00010b9e.bin
664a70c301435542853deaaa69de17932df8e19ef620f4019af1f17fd2fe579d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9E 10432 bytes
font_02_sfnt_off0001230a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1230A 16792 bytes

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