Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1f43273a2e3bd9…

MALICIOUS

PDF

99.3 KB Created: 2021-09-12 09:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 549c169d3bde7ec26ac201376c3d08d5 SHA-1: f595fe403a30d40b16cd53ae0bdfa93559505032 SHA-256: bf1f43273a2e3bd922324b444eb5b466305f300946460f6a20d3ce7ec5a58d8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting, suggesting an attempt to obscure the final destination. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://barudan.hk/UploadFile/file/20210902231154402.pdf In PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/91409655946.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/raxule.pdfIn PDF document text
    • http://tzsunup.com/upload/53806849615.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/xatizo.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/piponomiwoxul.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bidaduperirufefu.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134091fe9b46---5891827764.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/saxuxafadijoga.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613288ee7d04e---66169276463.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/jumbfhae1s5t8u2pd1tb9i9qb0/31619059868.pdfIn PDF document text
    • http://berbun.com/user_img/file/23976137709.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-6/20210906130025703253.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/17607474915.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/zabopitewewexilodavulos.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/tuditasagazadimutowuwib.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210909_1819BBA51504541B.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/botigijalugibiforin.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/gutitabubu.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/gisorujetedikigajozaviwok.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/84912647056.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/96531431977.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/18772849196.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/40383867115.pdfIn PDF document text
    • http://vodnik48.ru/content/file/nilenizonetagotesof.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382976a22c5---72286397076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=dragon+city+hack+facebook+id+session+idPDF 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_off00011b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001332d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332D 19368 bytes
SHA-256: 1731b733146a5ed81881f40a2a436b38fdb71b83200d821869b6299ef3dacaae
font_02_sfnt_off00016585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16585 11056 bytes
SHA-256: 96e738ac4fe20a6d2d940af5bcc64c93989748c552d41759b4920225c8587d16

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