Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbce1963b5d129f6…

MALICIOUS

PDF

87.7 KB Created: 2021-07-29 09:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2481398efe9731c8b204973d558e9202 SHA-1: 5c88bb69e1e8e68eee399c949c7422d6558c76cb SHA-256: fbce1963b5d129f6968627ff3b21275dfa5164e6797e64cae3829576432b625d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to compromised WordPress installations hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these linked documents. No scripts were extracted, but the structure suggests a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/jiitbr7oiuhivggda181hdlkii/puwivizilizafetivoferego.pdf In PDF document text
    • http://hgbs.de/userfiles/file/51961093375.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/p77l2of433kebftmpa41m0i731/gokaxuso.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/07cde222508923eaca9923c292a6f4e5/visadako.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/xisedivipujomijifezapum.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/4039055259.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ier4hn8fbps5nd7i5fq2qopfv0/52084837126.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/savawonosijamuwut.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/7bhhdkg1l4gs57o24d0jd3bbjg/58857670470.pdfIn PDF document text
    • https://webmenuplus.com/images/file/74491770599.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/er1mu16l46mjhs3gu0c3f12r81/18318580905.pdfIn PDF document text
    • https://anup.bo/images/files/58899267736.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/jouesvmk91c661lt5ipv8ol7c2/35435409181.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/43035169334.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607666078dc78---tobimibetabimuz.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/18726668804.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/17520199318.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b8d953b9e---tujemopawojegiv.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4f2fb0887---54558811911.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/nabujulelosonozake.pdfIn PDF document text
    • https://clove7.com/userfiles/file/posizonu.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609866935a2be---xobijugej.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6afd558e57---14717843262.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/021153124649.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/wezowuvewi.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160855b779b9e6---pututibivewelufiti.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/npooho9n5hc97ilg63ff99hasj/buzikowib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=tamil+old+midnight+mp3+songs+free+downloadPDF 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_off0000f241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF241 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A58 11168 bytes
SHA-256: 91cc296dd50df112b9b1b5c62f5eea8a1d7b638cb6aca41c304b8b23958256ae
font_02_sfnt_off0001241b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241B 16880 bytes
SHA-256: 285874e6ed202840a0b86cf7e76a25c44515002fac4648fabc9b3b5abc71071a