Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2d49851e66e8a1…

MALICIOUS

PDF

84.1 KB Created: 2021-09-20 01:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f0e5f17ec3a58d4f81de0efe52733923 SHA-1: 53bd0708fb94151480ac6ace7eccb7f2ed92185c SHA-256: 8a2d49851e66e8a10affcfd9e5b650ebe9982a82371f0306a16c0fe7430e1923
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier further support its malicious nature. The primary purpose appears to be directing users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/sudeluli.pdf In PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/feludozatulet.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9a45a8804---jifameveje.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/rimunuresubowofofowe.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/42191272175.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/68752138723.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c47330dc0e494fd193ad49156ef2515c/7487380353.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/78573063854.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/18585291023.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/1646996806.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/16473706394.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/8032071553.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/51730064814.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161445b0a51436---54314911097.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/75182846609.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jj063n3devpc88gvc43iks9kh6/87478191955.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146f0a2b2c33---28459129794.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/dotijisalu.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b3a7c5238---38366912319.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/gibowigegodanotamonamape.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/57937960772.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/q18ej77cir2l01eakgqci0pi64/jugazozi.pdfIn PDF document text
    • http://nprofit.hk/userfiles/fijufekowuwupujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=chamber+of+secrets+watch+online+freePDF 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_off0000e264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE264 10860 bytes
SHA-256: 6c0796d81d33873e34704d6b3cc4ad0123d7b5f0b3c99e3f48cbbd0f07d2f05c
font_01_sfnt_off0000fb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5B 18424 bytes
SHA-256: 8e1480ca709765e29502291e9f68efde6bf73dffed0f9b97dfafbadce5f6b1f3
font_02_sfnt_off00012ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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