Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f3437519c73829…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 19:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: be3d0db08c67961a440079caa4b1d3bc SHA-1: ed70bf656dd0616f926f4c1e0532f99a2c26a4cb SHA-256: 22f3437519c7382903736bb178c1f646f292b182e9b916d5bab94b7440346458
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and content point towards a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=site+analysis+book+edward+t+white+pdf PDF link annotation
    • http://cleangroupbd.com/ck/upload/files/sikabe.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3cee88d9e---durerufejikagesuxizam.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/l6953iv9u590h2ui53pgsp1cc6/zarukojamapa.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a0edc5b29fd5ef5c62571a6977c991c7/82616043373.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/dalegeru.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/5ea76eaa194a6027c71e2b9a6a54d6f5/67701018881.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/85821804709.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/nalcdf6tu70dtd3so4658tfjid/vejeba.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/31785787767.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/mozoxifekemezus.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/21934194641.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/bonukuzo.pdfIn PDF document text
    • https://hirurgija.me//files/xizifalezuba.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/dogefexa.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d787003465---82621033018.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/rafukidikomi.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/mumebuluromav.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/68649282790.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/88083951005.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3569c1bab---74939405844.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/6iamr41fej0r3v7brr1cqg13ie/vusojisagaziforaze.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/161dfa1e470e23afff594c29788b0113/pajute.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/76238033212.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/89944466494.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD841 11104 bytes
SHA-256: 584f71d73ab17c7d0f75e0a3d04017faa21e86e446a80e231cfd65ad94470aff
font_01_sfnt_off0000f1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FD 18536 bytes
SHA-256: 82a6ab7d6a81518478c27f5a85e48d463bab9a9859d2103406ea293397ffdb83

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