Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61b683ef9b624e1…

MALICIOUS

PDF

84.0 KB Created: 2021-09-04 12:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 31f9e998e84a9c76e4a9e592ef5291e0 SHA-1: dd84e926c9da69a835052a90db90536b35245f0b SHA-256: d61b683ef9b624e1f325c12372afd9aa9c2f744c97649dfa5ea1ef8470bf37dc
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on compromised CMS uploads and disposable domains. These links likely serve as a lure for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://crewmak.ru/uplcv?utm_term=rotograph+evo+3d+pdf PDF link annotation
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b86186d1fd4---35958484661.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/e3e37d2988e8895ffcc3ae1b77727177/bosiduwomuzet.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/99d85c9f3e90cda112e243d2a4a0e8f4/piwisebolubupedakebokesog.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/gerorijulamek.pdfIn PDF document text
    • https://megashina24.ru/files/files/vuwexowigoposazivalufese.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/92090978046.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860d482a9b8---vimojebiv.pdfIn PDF document text
    • http://tfforming.ru/d/files/73454122427.pdfIn PDF document text
    • http://hodori247.com/uploads/files/kiguvonegewul.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/48957894069.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/6ec8d638b5eacaf2a12cfbbf00024161/vajirewamole.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed9bacd9c7---nusuduganutaz.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/xovakadaduba.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/67kgq3vcg58dt1jqr3bqse1ckn/79156116019.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/pokowilato.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/49799489943.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/51101866154.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/70413911658.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/27357616947.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210614050628.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160853101e7233---41441814813.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/xutosemijekesuvaxegigix.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/62469503354.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/83487949366.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1612f795cc2215---78771743088.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/oo8l1vea62o2g7qmbes0nqv383/60987630872.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/b3601d1cee65e74071b55a5f967bf5fc/rokuwidixolofot.pdfIn PDF document text
    • 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_off0000e390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE390 17752 bytes
SHA-256: 22745fb42e723c1e95a3b869be37fe32856b1a0823ac2316d067d3c3bf37f382
font_01_sfnt_off0001117c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117C 10648 bytes
SHA-256: f90ad39bd018ac0913a1d5e5d4dec78dfb75a48549b5be369654b5cb1d63df84
font_02_sfnt_off000129e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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