Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d2c1989b6404c7c…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 18:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c756d8b5c041a79346cc4068e579faa SHA-1: f88141aa6db53ac5ea391abeffe6e34f28fe9c0d SHA-256: 2d2c1989b6404c7cfb58138c68b7a306faca4ae312e47b84fb403d5938b68b00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://queure.ru/uplcv?utm_term=peter+pan+story+book+pdf+download PDF link annotation
    • http://vekosgroup.ru/userfiles/file/81596145567.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///49082059393.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/71427674933.pdfIn PDF document text
    • https://rosycaffe.com/file/11730720547.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/51799139907.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/9eff988871ca4d3397560fa118803007/wugilutuvoxa.pdfIn PDF document text
    • http://imi.vc/upload/files/rokaviros.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/55397427588.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/dewumirufekadanif.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845e472a648---8712599740.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/gigikutewefuvakawobivafap.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/dbsd5pu1jqp9lcdb6fhjlvk720/96190190180.pdfIn PDF document text
    • http://designfromall.it/userfiles/file/50721380471.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/munonagetosesesekixigi.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/h50d72tlh4l2tf077c32asot61/56928334882.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783a45a2b78---najuwazejipozig.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/komabesonuw.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/rolesi.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/99193239681.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a78f38a4aab---56080602537.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/23085622335.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e819c90c8e9---52556444310.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/dataluzopujatojugugagaz.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/denugegugafenowegusu.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/60211545160.pdfIn PDF document text
    • 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://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_off0000dba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA6 10832 bytes
SHA-256: daf023ea6f0e04f9eadd6baa25e2a6d6a674e46184ad26b1773ea940c404b4b4
font_01_sfnt_off0000f4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 19016 bytes
SHA-256: bade4173688424d3b68a409f3c5a4b012fab57aafdacc0d7fe769526d912aade
font_02_sfnt_off0001267b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1