Malicious PDF — malware analysis report

Static analysis result for SHA-256 15dba6cb8fdf22da…

MALICIOUS

PDF

86.1 KB Created: 2021-07-03 09:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0ec301bf72452bc49f31cda51d5d45fc SHA-1: dd1bad15e98367559d5580f519efd9af3bc4dc96 SHA-256: 15dba6cb8fdf22daa0a45d4526d019d0c364ce1d8185e50d0e25dc6619c91333
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous URLs that point to other PDFs hosted on compromised WordPress sites. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/pckocdnms79gn2249vc5cl3tk3/zozopumofovaguvi.pdf In PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/ms41d9ur0h08p88agh83a3v0nu/17701966179.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/0466043f452c549302eb5ee2f9abca73/50212937680.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/keq8od7h4pdea78slh1mmgpca3/geleferakoberoga.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/5976918015.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/cdd0f1a72f93091450b2b6862bf5ecc1/48540017519.pdfIn PDF document text
    • https://schmitz.cz/res/file/divakelegexawekudo.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/bulebig.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a820ca0b521---83608202063.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/39645167076.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b04c877cffb---41269013592.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/japejepotupeze.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/20799690934.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b934ed5a3d0---ditilisupixoronarijatig.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1625203213.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c400f5ef00---bejepido.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05ce1e183b---fasixi.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/78fc5f883aa0474f3c033a86024622c4/11424205201.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d55909f4c0---39184093494.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3ad7078d2---95276870660.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/4d8d725a233b97caf840d83bb3bb473d/62192927897.pdfIn PDF document text
    • http://congluc.com/upload/files/19393910607.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/sitisidedodoniza.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/qhg97thn77fm034k6o987e2dg3/fovogel.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/xagigitug.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/st30stq3b7nhdo2ug0pvfjjotq/nulanebikevozolimarurovok.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb0b23d335---40655215865.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/7c00a72fac0d732f4646edd39ae8baea/junizapiruwilow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=if+mr+smith+had+4+daughters+riddlePDF 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_off0000ed92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 17096 bytes
SHA-256: c012dba0946dc1e5a4acd17f76dead633433912a7e7dd3427b43bb5b116d6077
font_01_sfnt_off00011a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001327c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327C 10704 bytes
SHA-256: 801b45bbe07f6e8f0c1d499ca7ac471a2df3b5c5a58cb51ea11d88958d64d33d

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