Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b905a721d95e57…

MALICIOUS

PDF

97.2 KB Created: 2021-09-04 21:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0e9a069476cfec9b9e9bbbd54f50331a SHA-1: 074ec4ccba0266666441c676abe6b8a06af6484f SHA-256: 30b905a721d95e57042dc06417b650b1d749fc92f250ae51f2a9b9d3d1f13565
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farm heuristics and compromised CMS upload links confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/fh1k2eajcgi7fo7etkbdp5dgkm/mirovagimupubuxo.pdf In PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fd027e337db---nixadanetuvu.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/73132443102.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/xudotujupinon.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/0feeskc3cjvqoue1l1ego27oi7/zuxovugetifulifajaxibawiz.pdfIn PDF document text
    • https://beaszemin.com/files/71236208447.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/dda93593bc04730fc94a142a10fdbee3/62242298690.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/spdis8neuusa8g6pvd25ksrjgm/welurojevafiz.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/lakaxesegewobilapuda.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/52825096516.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/f5fbaa65f7ec150ea06ddb214773724f/43632930409.pdfIn PDF document text
    • http://poorclarescork.ie/images/sisokujopurefo.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/32208560921.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/914764e2014faf2d45359ce8579ad005/74335261015.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/f3d681b7e27aefe9dad2cf91382acc80/juwukepaxorimovara.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/vavabujewo.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/kasat.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/f1cf6d80a190ca2133026740b81b0eb7/pepewibasabuz.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/0c663074d10c8aed5f4f62eb00491df7/tejavisibowujibebewop.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/96400833532.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/kevebapiparinukimoral.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/7608f974ff31ff4db1875ae22d8258a3/97378946668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=savitri+devi+the+lightning+and+the+sun+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_off00011172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11172 10900 bytes
SHA-256: cf58a921b6ebbed73cbd0ba1a844315f3ce7866da1686445b75c1ec2315c1a7b
font_01_sfnt_off00012a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5C 19940 bytes
SHA-256: 88b9c5c6d161725c6e53b169714f03435e96bd30cb41a43a51d43015d8d90844
font_02_sfnt_off00015ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1