Malicious PDF — malware analysis report

Static analysis result for SHA-256 4589aa68b9e0c7c5…

MALICIOUS

PDF

92.6 KB Created: 2021-08-12 04:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2a408d295034cd0e63987f3dd61969c SHA-1: f329f174c40cef21f5d7f45799ff68e1d88e7667 SHA-256: 4589aa68b9e0c7c58faaf7fe1a138690245f437151f59f9f14cbfde06493f1c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL analysis point towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • 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 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://pizzeriadevita.it/userfiles/files/51671004126.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/f0050570db91e36e6247a255855aa1eb/68146305729.pdf
    • http://teaneckhs1977.com/clients/67867/File/xibobozutejebobut.pdf
    • http://cck-brno.cz/ckfinder/userfiles/files/83782069491.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ce918aadf6e---70525472220.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b121db964---85995173755.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3d5b2f7c3---9390430801.pdf
    • http://kochamsushi.pl/UserFiles/file/nijanaxigazujatodaroto.pdf
    • http://perles-del-beya.com/userfiles/file/xawadojizerifimola.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/c0fafc86f645e0638124da6675244d19/98428841931.pdf
    • http://giayviettri.com/img-ftec/files/52754300228.pdf
    • http://perles-del-beya.com/userfiles/file/53636241953.pdf
    • http://mesterek.net/tmp/guzozawa.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/2tbkbjvoci3o6kkoe85l1im9tk/24744169643.pdf
    • http://dh-life.com/ckfinder/userfiles/files/23612279848.pdf
    • http://baigeleather.com/userfiles/file/tixifovatukajibajokakodo.pdf
    • http://orem.mn/uploads/files/wupufudoxogukodexaw.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105d97f48336---nurafusako.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/106e6330243e120888779eabe4aa95d4/kajafete.pdf
    • http://landonintergroup.com/ckfinder/userfiles/files/6917010440.pdf
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/13229409200.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/1fvkvqoiukos18q9bveprg0c2v/xupebet.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16084693681647---30445742751.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/klqcgvkv8rfgr8hkolj9gn4ja7/bawufilikiripirilipew.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=common+american+slang+words
    • 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_off00010648.bin
6edada1228577d502db14f518a20c939439c3818511a15d97c31bdd3a92e6dbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10648 10732 bytes
font_01_sfnt_off00011ec3.bin
c89eb22ed111367ccdac2dc8514ab58f29f781b79326bbbd7c8443e2b097fbcb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC3 17636 bytes
font_02_sfnt_off00014d10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D10 16792 bytes