Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98deebeeed26177…

MALICIOUS

PDF

78.5 KB Created: 2021-09-01 13:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2bc7a56918d2606bac35be3fab2fcc39 SHA-1: fbba7eac614ab4bd61ba95f73d86c2daeb0b8ec3 SHA-256: a98deebeeed261772925242525baf2bcfe7b8a202afc310ed1033bcfc62196f8
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not appear to contain executable content directly, but rather serve as lures to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160da1add465cf---21265866470.pdf In PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/pibodapovitenijine.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/58899580874.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/3026977442.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d506992b169---44998775637.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/9be771e2c1383e4a274d7de9167f99c6/gorofazuduzofutav.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/76670350361.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/99133486027.pdfIn PDF document text
    • https://bor-diing.com/upload/files/35784953315.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6db953bee---sokamexanixowusifofekebat.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/9b8a3806801acfec09404e6274e8bc5a/49805627707.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/57508254591.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f59f673b83---gulegolusupimojegaf.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/62452878193.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/34135522351.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210817/210817124357572201s3rgchckzmdw.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/75623676218.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/25950344520.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/1672233825.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/e69bae86fbf58d35035f598a05bde716/64504130135.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/kejeluvaxariviv.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/22893ad539850a80e57abebb69486c42/29809681749.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086c48806a99---letov.pdfIn PDF document text
    • https://fallsplat.se/file/78770260159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=doji+candle+typesPDF 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_off0000ceeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEB 17196 bytes
SHA-256: 9c0bd1314b8a202f3921417679fe8f829267002ccb2d16b5eaf14f03945e5992
font_01_sfnt_off0000fb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB55 10652 bytes
SHA-256: e5b12e9deef53d1157dc3e14092d9d30d05ec0896db507f4e37643183ca435be
font_02_sfnt_off000113d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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