Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be0a7c716da73b5…

MALICIOUS

PDF

69.3 KB Created: 2021-09-24 13:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 03e1dbefa4546ed50d5a0fd56adb7fcf SHA-1: c57ad78e5fe468dcf17544cb01d1f26e9d5c0541 SHA-256: 9be0a7c716da73b554d4209d10d0336ab64137e8f51aff3d241da623e8c43d0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Static analysis revealed numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

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 https://crewmak.ru/uplcv?utm_term=combustion+example+chemistry PDF link annotation
    • https://unitytradefze.com/ckfinder/userfiles/files/bamoberetiborilixoruzes.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/ziretob.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/vidal.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d54c7effe---jipibebovipomixivudatazo.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/68023813855.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/potafitedesus.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/momomuxajonitonugixe.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d30f3d0c7f---pekujejaj.pdfIn PDF document text
    • http://dentali.cz/files/files/lelumupobozolibafibe.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/xememinabazabokuweniji.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/69741745482.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/vexiperozagevozixuteper.pdfIn PDF document text
    • http://hidramaco.com/files/files/rumigezupirigikodiso.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ff0d9343a---fojugerivapedotajuxew.pdfIn PDF document text
    • http://ty-int.com/files/files/63482527958.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/zomagejiniwamopigoge.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/ditufutipanesadepisupula.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/wejukuzazafiwopepemaro.pdfIn PDF document text
    • http://juentai.com/userfiles/files/wupenigutupi.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/52537773517.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/loviwuxefojejunosenax.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/benezekomogebaroxosubawed.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/junifaju.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/98184386325.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_off0000aff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF9 11128 bytes
SHA-256: aa9341dec722b9a45a78ee3665e89c44cba6063da647ce371abc65f18238fb88
font_01_sfnt_off0000c998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC998 15240 bytes
SHA-256: 9e87848d7c4a1dba79dd824892900e4f97b0735c3d1b4c4645c2d069285fc63a
font_02_sfnt_off0000efa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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