Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4936b8a1acfe9ee…

MALICIOUS

PDF

86.4 KB Created: 2021-07-03 04:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f764cb022708c434a161928575f67800 SHA-1: 79c2634a5d910c1c52c31cd8e8ca317c4cfece80 SHA-256: b4936b8a1acfe9ee7104f45adf2c52ce2f27b20b9d8b629ff0725d56e98ff299
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm designed for malicious purposes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL analysis point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c025f276243---48953770817.pdf In PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/tezipitujagurorizexu.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/97544179937.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/25824765413.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/sq32mf9drrln6m8blgb6b36bf1/bezenegukevojabafa.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bea8876dc---64851493345.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/6b2bf793b1637fb242ef99dc988cd360/21065750156.pdfIn PDF document text
    • http://adveotec.com/img/file/6319753704.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/35078104204.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/3345559367.pdfIn PDF document text
    • http://akademibt.com/resimler/files/76146643319.pdfIn PDF document text
    • https://12shio2.com/contents//files/xawedujoka.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/1157639817.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/kurifumojivelagelupasaf.pdfIn PDF document text
    • https://zzhqhi.com/d/files/sunimawuwodabo.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/45170332c82e7f5a2231bf6dfffbfd96/bagikigixifukabo.pdfIn PDF document text
    • http://93564497.com/userfiles/fasev.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/bap22dhdadltshmlfhmn85muq0/jinifebabu.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/7042154029.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/5t6f4051d5b4tecdsgs2lngk67/kixewi.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/62305088633.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210629/file/16249244077880.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/lifajemifafuxomivi.pdfIn PDF document text
    • http://aimic.com/userfiles/file/falabok.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/xaxevemogorar.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/120baa0689166c527a046ab67ae7684c/dofunapikujo.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d4187ce50---16154411360.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750a5e12c74---67687933859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=faith+in+hebrew+meaningPDF 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_off0000ef6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 17312 bytes
SHA-256: e4d7b5775e8f85bc1ed884fdcc7ef8610353ca48472462a380c191591f3156b9
font_01_sfnt_off00011c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C70 10424 bytes
SHA-256: 1ab7902ad7d0feff6be94f824601c3b273b6f1f17685437b84ca27b8c39978eb
font_02_sfnt_off000133e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1