Malicious PDF — malware analysis report

Static analysis result for SHA-256 65aa3fe4d59a5057…

MALICIOUS

PDF

86.3 KB Created: 2021-07-07 19:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1956e17293148f09ee44b6ec7e93cdc9 SHA-1: 1e84a1022a8d71e1d7358e660432ec2ed9361ccc SHA-256: 65aa3fe4d59a50570e14876464ffd6b43bd86538ed2f3944f0222d1963233f21
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs lead to various unknown domains, some of which are hosted on compromised WordPress sites, further supporting the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://fujiya-burbank.com/uploads/files/fawavifudetuzebuxujar.pdf In PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/rilugegofezumoxepodarep.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4167981efb---90187803045.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819d1c4afe9---75510964627.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/sijofibubonizonesowesanif.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/a77b015d13c12bc0b8f15b81134dca61/29822927728.pdfIn PDF document text
    • http://kurdumovldpr.ru/uploads/files/jakuvebu.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/96092314597.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/hn1689e4kvjlp8mk7d286fg5o5/lupeliwoxelitofitune.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/guwuwudatefatubajimina.pdfIn PDF document text
    • https://maisonforville.be/documents/file/weruvulod.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/be43ecf5dcc49f5a010d01a9cf340365/figeraraxupukex.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/89404925764.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7372421d3d---pivimolozewid.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/24296147504.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/numaxabuxezujajofisusiwel.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/68f2e4290e15dffa51191ed855324d51/jobekerawodekesulabezupip.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/f884301dbddad4eee2fed9059ffd613e/vejebinutanowaripef.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c773b459e85---27552196977.pdfIn PDF document text
    • http://chromoink.com/updates/file/37877426486.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/zumuxibotebeneropogir.pdfIn PDF document text
    • https://argumentua.com/i/file/nurijoberirofi.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/vanadunusikep.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160bef83852695---tukobol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=is+it+ok+for+dogs+to+eat+grass+when+sickPDF 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_off0000ee15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE15 17080 bytes
SHA-256: 0bc5b0172ed3d845b9c82fb668a4ec38d2272524325e0e7e22a89504e0620f90
font_01_sfnt_off00011ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E5 10840 bytes
SHA-256: 2a4f2d1c8bcc15b1555ec00c23b145f31af0fb4b83d1f4874023d1293508a287