Malicious PDF — malware analysis report

Static analysis result for SHA-256 3454dcbf4737e1f3…

MALICIOUS

PDF

82.6 KB Created: 2021-09-23 03:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2561e0cd2610c3e69bcbd0b0e7412f44 SHA-1: 7f064d99a5ccadc7710fb34fa9cfc6f24b054803 SHA-256: 3454dcbf4737e1f312acdfa5a3148dc9a7645ae1ce0289728d81c30c173155c8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://bikeid.net/ckfinder/userfiles/files/12548677517.pdf In PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a5301a1657180902ad7c6b98b298a2b1/rumuroselalarel.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/92111592760.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/kumapepuwixatawutogova.pdfIn PDF document text
    • https://smilewax.tw/uploads/files/202109211122308138.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/25558487440.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/16473877779.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/74327592550.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/kuminemesi.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/rigizonenasugudaz.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/82814244437.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/rozelosorizaxerekibe.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/dafutar.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149bc5a99917---47471514490.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/jelujatixap.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/11071464440.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/46766439533.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/6609232014.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/99413646927.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/jaxod.pdfIn PDF document text
    • http://thedreams.cz/files/tuxonid.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0dd4c21e5666646d75b8f936c562e20d/54669246457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=year+4+reading+test+papersPDF 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_off0000ddf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF3 10464 bytes
SHA-256: 52489c8a67a30e95211ec923a16ab28526ac3d8b4ab1808b0a96478c43f771ed
font_01_sfnt_off0000f59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59E 18208 bytes
SHA-256: 050ca6b04f96d2dab9e086f24da23ad768aef39433bad4a37da093e8c0b091e0
font_02_sfnt_off000124c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1