Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1bb7638969f5200…

MALICIOUS

PDF

71.8 KB Created: 2021-09-28 23:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2e2fa3b1292e398b8c5f114bfccae05 SHA-1: 02563951dd9d086e2fde5604a48dd14c2a58320e SHA-256: f1bb7638969f5200ec60eb3239d89803f48a1b03b69300006bad236c9874dbfb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=truman+capote+answered+prayers+pdf
    • http://pm-ural.com/uploads/files/15123151939.pdf
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210909132021.pdf
    • http://brlairport.com/images/file/leguvedinarezefozaf.pdf
    • http://webursitet.org/Files/file/94521408896.pdf
    • http://lohoithaiduong.com/uploads/files/pakepa.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16152f397a5c35---daxolemogugu.pdf
    • https://yifff.se/userfiles/file/vebupodun.pdf
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/79291489623.pdf
    • https://banghenails.com/upload/file/45029012661.pdf
    • https://svingenieria.cl/userfiles/file/dajejorobitakekugo.pdf
    • https://confidence-ist.com/ckfinder/userfiles/files/divemevawo.pdf
    • https://hotelite.in/userfiles/file/repew.pdf
    • http://aaaexpressac.com/userfiles/file/sivoxumupomeganele.pdf
    • http://master-stroi76.ru/userfiles/file/27251414848.pdf
    • http://grupophi.es/uploads/files/pafitixirupuwigij.pdf
    • http://adice-area.com/pictures/files/fesemozupadebumopivoxa.pdf
    • http://tecksco.com/upload/files/46813787652.pdf
    • https://suavitinhtannha.net/upload/files/19568449597.pdf
    • https://bilegt.mn/userfiles/files/52404429470.pdf
    • https://vnjhanoi.com/upload/files/kowijutubek.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393d176f480---xosevirupomutega.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16139c05dad65d---rejunagaxukawusekodifeno.pdf
    • http://simoncaulkin.com/images/29687810023.pdf
    • https://akvanova.ru/sites/default/files/77072831350.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3ce.bin
77a7cf69af05cacd6600f04b868f724dadf2e21731395f3f5e8ae46bce676bf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CE 17576 bytes
font_01_sfnt_off0000e054.bin
94ba10b66881d363c8c5ea8343d673e3ccb08f7ac80be6d70c9c2263f8af1814		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE054 10908 bytes
font_02_sfnt_off0000f9b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B3 16792 bytes

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