Malicious PDF — malware analysis report

Static analysis result for SHA-256 beed30037f2b8138…

MALICIOUS

PDF

70.8 KB Created: 2021-10-02 10:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 577d523b00c69e813846cc057931bc2a SHA-1: 686fab768622f7d2d5ffa963b29e38c50964022e SHA-256: beed30037f2b81386155af8226fa2072abe92ade0c532a9270c02e9ee818490c
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many pointing to compromised websites or disposable hosting, suggesting it functions as a link farm. The presence of PDF_URI_IP_LITERAL and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating attempts to direct users to potentially harmful content. No scripts were extracted, but the overall structure and heuristics point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://vo23.ru/upload/file/zifubimugumobozaxadolu.pdf In PDF document text
    • https://ecohort.biz/userfiles/files/solifitiradejupavikug.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/47544354194.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210929_3E69594321B6CA33.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/56227176782.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16150843e109b6---70889468647.pdfIn PDF document text
    • https://asken.as/bilder/file/bimiw.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/70094208446.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/mitafasap.pdfIn PDF document text
    • http://yensaophanrang.net/userfiles/file/96824453801.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/67858228291.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/lawesakinis.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/29081732025.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/tajezobavumuludego.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/13704077813.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152e4f7b2823---37795360435.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/mubumoviwiluza.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/rixawaxatibomaniriguwewe.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/63332561924.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/92717498644.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161309919d1129---gegemexufefi.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/hmq3cbdi3oi7jkgi1vltaec1vs/65192798068.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/tolorofedemapagolo.pdfPDF link annotation
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/jevigawojasidiwakuxap.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/71567438072.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/13670548300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=php+code+in+imagePDF 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_off0000b320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB37 10552 bytes
SHA-256: 489c222537e3073e6dd9c36308a58b489bada80e85ea180542e006f1ac933277
font_02_sfnt_off0000e2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 17000 bytes
SHA-256: eaec499c7f55e43f09df97699fb5fdf5c28c0d1278e3bd6a7b2fbb6662e00fc5

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