Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b644bd5bb01f3c…

MALICIOUS

PDF

103.5 KB Created: 2021-08-04 20:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4a1ec50af1f564e76cc17843d629a4ec SHA-1: 94eb4fb5f326e0ef689c72d07d335cb134f25ce5 SHA-256: 17b644bd5bb01f3c4404b01034a85c8dd33d8f5d0e11ae457f05d62f18d018fb
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of numerous distinct hosts and links within the PDF supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607484598455d---sagimusepiduxosigu.pdf In PDF document text
    • http://fra2ange.it/userfiles/files/vidulujikifikumozo.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a27e16b6e---96237882889.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/13b80409bec2fa1e9278577739f07de5/nekipusivi.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/800cc7e5f4c31cb8dbbfe0dc4faaa8cf/6453904472.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/34370730763.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/fizawejemilofizobalalanir.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/ludimaduf.pdfIn PDF document text
    • http://productosole.com/wp-content/plugins/super-forms/uploads/php/files/n3fknbd4n5pehkuh650nfmg2lu/3630592823.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/25293542842.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b490b4b42c6---relisoligalurilanumopa.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/loduberuvu.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/58143050906.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b9242da56---33852867735.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/49561619001.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/40447758387.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/de01c3b7cded0c267f0b58416cd897bc/zaxonelimemupo.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/d33ff331ac429b91adeb3b26974dca4b/dorel.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/904103705bd169bb28d8732497495542/novalefejewitaza.pdfIn PDF document text
    • http://qdjshg.com/files/file/75385810684.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/eaf0ced3d5ea6d053b6ae8eb8b09bb57/92730853731.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608183d9073e8---fiwop.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/59439981280.pdfIn PDF document text
    • https://reinigungsfee007.de/wp-content/plugins/super-forms/uploads/php/files/32p8upvdrsjdi5rg37uglg4sa5/53033865408.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/7rt59phi5dj5nelh36cssi5jhh/73229915522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+understand+phrasal+verbs+easilyPDF 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_off00013047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13047 16888 bytes
SHA-256: b2cf3ee93f07392b481a375f6afe247f2cc8d58ef7a98e22dbd18b0cc2327b5c
font_01_sfnt_off00015bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001740c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1740C 10988 bytes
SHA-256: fab054d350fd67754d4ba8672c652fbf27d44a539d802a273d0f40007ffd8f0f