Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58194ec92421d00…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 21:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42ca9d6569f0ba382e2d93f7e7e80092 SHA-1: 5986bce93fa47e827e2f3af29b9e25ef21c0db6d SHA-256: d58194ec92421d004d23f44b3f6b87f210c0650c33c44ef1636ae9791153cb76
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs that lead to external sites, some of which are hosted on compromised WordPress installations. The primary goal appears to be directing users to potentially malicious content or phishing pages through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://aranysolyomfeszke.hu/editor_up/7716219279.pdf
    • http://makesrealsense.com/ckfinder/userfiles/files/64154799287.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/grhk6b5062q94ork8m12j7js82/vawipu.pdf
    • http://gibisch.com/files/files/22493764198.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/48dd7411faad9d5b36e6813fa821b3bf/70445099998.pdf
    • http://cybernet.asia/UserFiles/File/xilimiwe.pdf
    • http://szilasfood.hu/pic_upload/files/34334609489.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/b3dpnf6d5491n4d5uc3omoju06/39296000960.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/1ba19e683fb690eba3f3352ae6cd69c2/derufojuvimajub.pdf
    • http://59irc.com/admin/fckeditor_upfiles/file/2021081911003780554.pdf
    • http://arci-mp.fr/admin/File/76375180632.pdf
    • http://automsystem.com/UploadFile/file/20210616124639272.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086bfe38d766---39507513094.pdf
    • https://newshieldinsurance.com/demo/gsa/final/images/file/zojuzapemilitejefa.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/e433ba3b306d1b32276c7664c59325e5/79297975194.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/msrltff0i8497946aei03cmq1f/47598009475.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/m6f5iofmuue7uql6nna3k05i9o/fidikikofenazunabosubuw.pdf
    • https://stallion-international.com/userfiles/file/69043392621.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609a118c0ea4e---gakuze.pdf
    • http://akkoryazilim.com/userfiles/file/83225311646.pdf
    • http://muntepa.com/userfiles/files/62751120390.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125bc16ca7da---suniwevoxo.pdf
    • http://xaydungphongphu.com/uploads/files/10358399782.pdf
    • http://tevukasveza.lt/ckfinder/userfiles/files/disodoji.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c3d28a109---95198722530.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=shrink+pdf+to+a4+size
    • 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_off0000d99e.bin
790cca28204f5b9e7f727992d4357616a70fd84833502a79f785c6b102545a6c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD99E 18736 bytes
font_01_sfnt_off00010a6f.bin
a61c7cc5b65641b47fd04d4310211392a71298d10d3210eadaba4136125c1bcc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6F 10856 bytes
font_02_sfnt_off0001237f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1237F 16792 bytes