Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7285d39ace6ac72…

MALICIOUS

PDF

76.9 KB Created: 2021-09-03 09:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a52d19e8dbd6683f9a2bbf29bf64c187 SHA-1: 14a66f3465da34a1d788387a1f86099076380c14 SHA-256: d7285d39ace6ac72deffd91862456c2a9234a7d583df4f77424ccecfcca4a7b5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a secondary payload or phish for credentials. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ahchala.com/img/file/vakozawef.pdf In PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/if8a7b2h5vnoa73903kihqtgim/27650824536.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/xomapetepevujurawiselewon.pdfIn PDF document text
    • http://txextremecarts.com/userfiles/file/jotexesojabaxivodotog.pdfIn PDF document text
    • http://macauroommate.com/ckfinder/userfiles/files/tifunikirutanutilinumin.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210830_28B79E66FA2673FD.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/52298854206.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/dofixukimotatilo.pdfIn PDF document text
    • http://shesob.com/file/files/34711241380.pdfIn PDF document text
    • http://peoplefoster.com/pliki/64310493333.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/8a0d3a45595a32e04739d5e64c184640/19220035591.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/3rm39jrphco4qvrnnsil6btd92/59828236233.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/sapowuxu.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16075c167f1874---fesuga.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/34494729939.pdfIn PDF document text
    • https://andhimazhai.com/images/files/ginujebamanekinixujin.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/95913619919.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/50142849365.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/9547ea304a6308d104aff5257a1adf3d/12225788889.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dce82b7019f---navivexevewisa.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303e637b516---4913524130.pdfIn PDF document text
    • https://digireg.se/upload/96152370022.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afca18cd216---velazuzixif.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/9127467082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mitsubishi+pajero+2015+service+manualPDF 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_off0000bd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD84 20228 bytes
SHA-256: 619105667a1a347e2e7049c6ba03d15404bb49e75e46f8f16210381f67b1fba4
font_01_sfnt_off0000f120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF120 11496 bytes
SHA-256: d5d2f13038629c5590d75895785e4070e52c39cabbe192331cc074f73c64251e
font_02_sfnt_off00010c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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