Malicious PDF — malware analysis report

Static analysis result for SHA-256 200557e702136220…

MALICIOUS

PDF

69.5 KB Created: 2021-09-10 07:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 603fe1a41d38685e0bd1df450097cb62 SHA-1: 0c0f4e23fe8b23bd110c81efd32364bce9b54fa1 SHA-256: 200557e702136220446c80da06ed53f1d3a50014798b1d5f3e84d1edea978f28
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://matkinhantai.com/luutru/files/15555671147.pdf In PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/48586750306.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/9458362982.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/15671723876.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/kevatasorodenovure.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/13945482769.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/fizezelerepumimaxi.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132da6b0fde7---76659900830.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/gegaz.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/19771300899.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/kexovipamokowamuba.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/674a33d4394c220335c513ceba47eb34/vewijasesuje.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/bedewure.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/zibebizawo.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/97708862550.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/bopolupafadax.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/37979886465.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d37d8dd41---74736852538.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210902_075331.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/48103054864.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/zevurisatokimatoguxujal.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7932df553---34529119728.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=hardest+lock+screen+patternPDF 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/xIn 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_off0000b4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A1 15048 bytes
SHA-256: 2aa7c090069b29ac3f9a1b0132b4982e3663fb3bf8e55a1516d4ddf752388ebc
font_01_sfnt_off0000da98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 10496 bytes
SHA-256: 7aaf3e4307754a8c251b44d2119af69a272941fb48837cabffb2b755636cc90f