Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35bcabdce52680d…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 09:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 18bc409951c120b043ffcda4fd0bd804 SHA-1: 82911757223460f484fa4e7773680eae62560976 SHA-256: f35bcabdce52680dffdfe82cbce2ad0a203a11b1779843de8e323e0903e3430c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://laborke.ru/uplcv?utm_term=how+to+block+a+number+in+moto+g5 PDF link annotation
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/16725591165.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/lolojorebep.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/66499671436.pdfIn PDF document text
    • http://chinazzjx.com/d/files/77286585943.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6eb545ac7---konipodisumi.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/rijakosawabez.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/digufusevejurinajuzop.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614735a7e3091---jimezoleliremivu.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109061959169759.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/wazerod.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/19663903723.pdfIn PDF document text
    • http://hidramaco.com/files/files/palulixapemipusurataf.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/69584982382.pdfIn PDF document text
    • https://quangcaomattroi.com/uploads/news_file/rexavomudosuvurar.pdfIn PDF document text
    • https://reha.bg/content/upload/file/75554533540.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e625b777e2a507c715f9f536ea3fae00/mesurajipedufapu.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/parod.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/zofugotu.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/58420044384.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/61490029018.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/zuborurariwone.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161408f67439e8---94520330991.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/dezowolotofanasa.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/furatanusatitexarup.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af401892d7---werodewigedewunonavinag.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://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_off0000b01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82D 14928 bytes
SHA-256: af9a04a9d4c51b3e615ccf0bd6dc1a237e535a4b7a814f28911eb27773deefaf
font_02_sfnt_off0000ed9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9E 10948 bytes
SHA-256: 292a801b54a2ed09d15a8ca3cb52fc5b94c3f04e51ec78b034c7bbe3903d2432

Open this report in the interactive analyzer, or submit your own file for analysis.