Malicious PDF — malware analysis report

Static analysis result for SHA-256 67df16e259d153ce…

MALICIOUS

PDF

98.2 KB Created: 2021-07-04 04:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f9c6d340bdcc026c2498abba12cd55b6 SHA-1: 2484e11032d50d5e10b0c52ba9eb8f1ded1814d4 SHA-256: 67df16e259d153ce625bb75e5e417e1743896d3313bbbebe9f59b46a1af92f35
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://adasms.fr/userfiles/file/59435661393.pdf In PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/6ibb3bdtcldkah96k75clebb40/golegafo.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/ebac50a345bf457d7b590bff05a3b5a2/75821206157.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/f05e095410412af7995bbeee0075fc74/64644558640.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/2eea2f32f2c49c37020ffbfb1ed6ec6b/sizovatamuf.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/pexofoxodujewigimimeg.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/bemofofijeme.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/6dba07ed0407c55ac17c61755f252b67/buxizimejawimemero.pdfIn PDF document text
    • https://jobtiara.com/files/files/betejawitogotile.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/06327b4de2287a88de20a30c6be8fbe8/jiletedexilopapolunepi.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/bafutunexitufobejubabez.pdfIn PDF document text
    • http://aliotoconsulting.com/clients/862286/File/52407975222.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/mapijudamek.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/74559375630.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/72a82d6a703e65bbbe19577466182d14/wedogakikagirus.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/2402836a69c256ab7e0dbbab1810059e/21437467349.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/vewufezovog.pdfIn PDF document text
    • https://grandmake.com/userfiles/30452666992.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/segezezefigodoxotumu.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/zirawawumaxaxijis.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071e2192aa27---mifetebetikivilexagobo.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afe540dd19---68263285908.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/60310842279.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a5303c30d---1476854047.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/napodupewodesifasiratiwer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=and+after+semicolonPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DD 10620 bytes
SHA-256: 95428ff52e2c8242ec67ff20e2ec2f9e536320cfd6d43646774ab39ea44fe45e
font_01_sfnt_off00011f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F26 17532 bytes
SHA-256: 815887e45b583cd6e2e4b1bc1568102c7e9d7865c47cd3f8ced327611bc75689
font_02_sfnt_off00014d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D18 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_03_sfnt_off00016323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16323 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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