Malicious PDF — malware analysis report

Static analysis result for SHA-256 43386d4ca4d85d46…

MALICIOUS

PDF

68.3 KB Created: 2021-09-07 08:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 13684aae374aaf957efbeb94d9ced37d SHA-1: d2309e5dbe1e0dd409ed904dc4b1917ba58742ce SHA-256: 43386d4ca4d85d46df6d5c6df70cdb9b3a88e7a6e38aa88776fb3692e1cd05ca
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting. The primary heuristic indicates a PDF link to an algorithmically-generated URL, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the structure strongly suggests a lure to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://angelascanu.it/uploads/file/libovuxojid.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607184b510e13---xisifojutuvo.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/010627399588.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d71e69c4dc8---pazaxosufuwinebetififone.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/32400686071.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093ca733fdf1---81171864142.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d171195c8---tiburapaja.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/19483547312.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/wedorofuso.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/69936992044.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/43696638627.pdfIn PDF document text
    • http://balone.net/_upload/file///dojawopinetepatujupizaxis.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/basofezavaweludo.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/67784871800.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/51042477459.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/41360990824.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b325b4e83---gobilakig.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073af3e2d811---11587715089.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/83661238036.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de0dd460ef1---35360442480.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16123e9f7ae917---dabife.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/4204054764.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=special+education+in+finland+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_off0000af44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF44 14716 bytes
SHA-256: 4d6015341f6a466ed1247f38480eefd6712c0b5c3962f7f2c4685cac3b07ad9f
font_01_sfnt_off0000d412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC29 10520 bytes
SHA-256: 0c2f628b0e7e5513093a5dfa3f3ae5fee80088fc3a787dd72e7c5b6a3eba25ac

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