Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33c0959d644601c…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 16:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d0ea4a040146e2b6fb17740120004008 SHA-1: a6a3f603f972816c356ad2cd1607a1ff1611a13f SHA-256: d33c0959d644601ccade2fced170e6bd8b4b35813dd7c1aba74b842625740e62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of multiple external links suggests a link farm designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://allytemp.ru/uplcv?utm_term=aggiungere+suoneria+notifiche+android PDF link annotation
    • http://slbreakingnews.com/ckfinder/userfiles/files/32079227616.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/30468017315.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/govesog.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/3a0ec98bd1560a82fc664594bac29246/28183701346.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/parilunediwinazixudebez.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guzedotuwugabeb.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-2/20210902120227722463.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/tapukan.pdfIn PDF document text
    • https://limsurdua.com/contents/files/14845470366.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/21769518009.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/93977754182.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/53167297909.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/i9rake0hqi481de25v9cc6dnd3/gadonezajigebonerojadenag.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ae12ca99275d369855bf1323cc7aaf2d/fibexurumuv.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/17275291657.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/6996185833.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/desababexanudiluzizive.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/76515038242.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/9a6d2574becf015e60fb1e74271b5caf/zolukijanirusebixotesobu.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/430113238.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/fexofemuwisamud.pdfIn PDF document text
    • https://protraderin.com/userfiles/file/97711870729.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/44621459678.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/a399qf6p50rpqsorra9e27df83/wudexobipa.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/25241226966.pdfIn PDF document text
    • http://hbaoge.com/upload/files/lebabuza.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_off0000db36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB36 10788 bytes
SHA-256: 4d4266c911bffcdb2705f71a19a457c3d8910dcc0ab94df22549033c2538f6f1
font_01_sfnt_off0000f3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DD 17980 bytes
SHA-256: 22afdc48ed86cdb38213920ef16b25b9f76efc5e0f53f2c43e2da920cc2ccb6b
font_02_sfnt_off0001233a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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