Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b1480b485e8b3a…

MALICIOUS

PDF

73.2 KB Created: 2021-09-06 23:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4eb9de8d15f973f1ada603198770e4b SHA-1: a99cedc3e0df1da419e60484a1fa0530a87619ce SHA-256: e4b1480b485e8b3a4802467f09351db415493a6c4794a13d0558c038c10ba5b7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains numerous links pointing to compromised WordPress sites and other domains, indicating it functions as a link farm. The presence of algorithmically generated URLs and links to disposable hosting suggests a malicious intent, likely to distribute phishing content or malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/l1cevkh7m9h4c7fn4b85dh0032/sitasozonela.pdf
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/18133703324.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/6be20a2ca2765edecdff879908c744da/wojoxaluketenonokenegud.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/33ccfdfc04d7e0357db994d25603e248/90836577337.pdf
    • http://abpaluso.com/upload/file/ridepar.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b65fac5205a---60450881643.pdf
    • https://artbynela.com/uploads/file/kemon.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/575be2735a2c908291fe0dc2ac16cacd/xatixufufivewulolofipewob.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/fb6bo6l41vtfjt860s0jdnm7hq/84410593724.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/0glaoqm6m64a1dcd6s02mrmqtg/zilosimekawetalinutodi.pdf
    • http://nlureunion.com/clients/33063/File/51994187633.pdf
    • https://777mto.com/contents//files/lovobuzitebesat.pdf
    • http://architects-desk.com/uploadsfile/soluzuf.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608861b26e28d---38752358973.pdf
    • http://urbancollab.com/userfiles/Proj_Name//files/68751702302.pdf
    • http://gibisch.org/files/files/63569899017.pdf
    • http://goodmix-psc.com/userfiles/files/jiwawusomekeba.pdf
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/64238822589.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f78d8c6a5b---69086710658.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbeca4467b4---gajiki.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/wewivizazodupumuda.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/o63cipaepokn1a6f21i4rp4of0/wajowarizosafegumotabur.pdf
    • http://www.motorradfreunde-toggenburg.ch/up/files/98393273669.pdf
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/1484748056.pdf
    • https://espiber.cl/images/uploadedimages/file/juselafokutubotoxifana.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=calculate+scale+factor+worksheet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF73 16792 bytes
font_01_sfnt_off0000d785.bin
467df039fb6cb5e17f167d2e78ce588e4c73e1548650bc93f876875b7c1452da
pdf-font-stream PDF embedded font (sfnt) at offset 0xD785 15400 bytes
font_02_sfnt_off0000feca.bin
12267212f32c5b3ad4d1cbb7cbfc7ed0c482f2399a0829a65e6d0bc5a537d440
pdf-font-stream PDF embedded font (sfnt) at offset 0xFECA 10548 bytes