Malicious PDF — malware analysis report

Static analysis result for SHA-256 611599bf0519e575…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 18:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4a3689d2530f3ca2c236732d9564679a SHA-1: 37fec9c24dc5a26709d57dff3fbebc2781622da9 SHA-256: 611599bf0519e5756bca2b35f147c926b1c58bfd89dd1c317170c8d8e07d5cba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, which are likely used to host phishing pages or distribute further malware. The presence of these links suggests an attempt to lure users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://strap.sk/uploads/files/pukop.pdf In PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/484de6c55312db216628407baa344636/52499489773.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/a9ebff2090536ffd06126d1aa227ec3e/jepebumobodevevam.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607758b0c455b---vivunafexuvomesapan.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a35e48fff0c03576ff82fccab78cec82/ponofonujotufedog.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/gkffi2dotpnp20m6fs4h30db04/zukinuwivij.pdfIn PDF document text
    • https://betibg.eu/webroot/img/files/98375116286.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/qhcb4gkrcjkusklm13sfu86fva/87930048631.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/77916642078.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/85917502092.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/39869822353.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/gofoloze.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7d975e042---1301160375.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/sabufidinafepizekomataf.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/o8utt5qql5u6e4t8qavnqr2cdh/danewowekilafalemilabuxi.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e37001342---98312642158.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125b4453bd3e---veruzutasebida.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/bogubozadof.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/lelilib.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/bubamuxuvop.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/32875466627.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210822030145263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=linguistique+english+pdfPDF 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_off0000d330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD330 19528 bytes
SHA-256: c36431c4baf409dcb92904ed7f73cfb52d944c39596df2f7ac8acdc71163b167
font_01_sfnt_off00010623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10623 10600 bytes
SHA-256: a1c66777a3717e2ef19de0778621daf01386069803acc289d0a1fbac8d00fad0
font_02_sfnt_off00011db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.