Malicious PDF — malware analysis report

Static analysis result for SHA-256 78991e9ee872f7ba…

MALICIOUS

PDF

97.2 KB Created: 2021-07-23 01:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6edc93bfe11bfb2d22e03ebcff3dc276 SHA-1: c1bc8415f3de4c7ff11877b34e326f227e7bdae1 SHA-256: 78991e9ee872f7bae2b84cbfbfd494c011c87c1bd949dc5ee46308964996fa88
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to distribute further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to classify this as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://au-zlato.sk/upload/files/xabisusavub.pdf In PDF document text
    • https://klairtransport.com/uploads/files/vaxoxotuworikijopuvur.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/88795629198.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/21750207554.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/de77qkk4n5gdevjcsp05d21urm/degujaxek.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/fmkfb4rb077lhlvmnhppm0rbt1/padagimulipamililozi.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc45086ea7---darinuvukawurafatet.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2592e0c4a3---42109675113.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/34466847825.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607780b31b912---66997400117.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/ponobugerajusiwe.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089da988136e---munuvituguzibodefaruxijat.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/dodifenuxefato.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/beralapikidijuzozurita.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/zizezokotolalubemogesebeg.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/bokonexubimitiwituzipoke.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/kemitibakukifijusasu.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/82400669573.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/72519159188.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/4545964970.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e7e06bc10---46759913745.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/9b9djcbn8rj7uh5mv1fiso75e6/47151696641.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/44353710861.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160826b739bf7f---vilexixikodibegixetize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+get+command+blocks+on+minecraft+ps4PDF 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_off000113b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC6 18124 bytes
SHA-256: a51417b6143c9765d3432253a21dcce49ee354e51b42da477452c3755e607046
font_02_sfnt_off00015baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BAF 11352 bytes
SHA-256: 6799024bd788f74772a55593548379fa94c8ac13c9789e8f679c4325ef82634b

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