Malicious PDF — malware analysis report

Static analysis result for SHA-256 3592115803d93958…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 20:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8db5d35a4eb2f70393d39a0673382862 SHA-1: d0ff88139865ac678ceacfb9e7643c6088a60bf9 SHA-256: 3592115803d9395884eea5b81577b29d834f29c3c8357d8eba1b556da92e5caa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to potentially compromised websites. Several heuristics indicate the PDF contains external links, with some pointing to domains that appear to be compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and link farm nature strongly suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://timminsrenovations.ca/file/d4IvOnNRhADhh6S1.pdf
    • https://childrencareandliteracysociety.org/userfiles/files/fejinoluwosub.pdf
    • http://cukorbetegshop.hu/files/79034557719.pdf
    • http://sun-green.be/ckfinder/userfiles/files/zuzibogewepejiremoj.pdf
    • http://doks-films.com/pcms/content/file/zegivuba.pdf
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/jelag.pdf
    • http://carrasvilla.es/uploads/files/kotubujedibita.pdf
    • http://meandnetworking.com/ckfinder/userfiles/files/lobowosi.pdf
    • https://fo-prefectures.com/pages/files/zasasazejutos.pdf
    • https://anukulagrotech.com/ci/userfiles/files/48786820.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161407ebc6c414---26049579933.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/bv7ldgm60i40va5ademfoj9kov/volozoxijalaxeta.pdf
    • http://homespakistan.net/magzine/uploadfiles/file/95200649585.pdf
    • http://ekopaczka.pl/imgbrama/files/94073976870.pdf
    • https://groupunsur3.com/contents/files/vafuvazodidinumom.pdf
    • http://adamlegal.com/userfiles/file/lusagonopekejevojutodow.pdf
    • https://partroyfuneralhome.com/partroy/assets/file/3285442685.pdf
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/siropopubimaxupono.pdf
    • http://fsf-vastroad.com/userfiles/file/53788363584.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c40aada26---90320083587.pdf
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/ralalopurukuk.pdf
    • https://babetravelling.com/ckfinder/userfiles2/files/37919955107.pdf
    • https://vinadesigndanang.vn/uploads/image/files/11062431369.pdf
    • http://directopinion.biz/uploads/FCK_files/file/sudogikinoliw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=arts+and+crafts+village+case+study+pdf
    • 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_off0000d837.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD837 16792 bytes
font_01_sfnt_off0000f04e.bin
b0e36583a9b24faf4ebee1681630373de112f1cb73cc530f511d24bfab9d7ac6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF04E 10936 bytes
font_02_sfnt_off0001099e.bin
ab6b1882eb6a2b3548643371da65262bfbeaac36d125145981e8edffae7cf7fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1099E 17668 bytes