Malicious PDF — malware analysis report

Static analysis result for SHA-256 877ba26dcab2d931…

MALICIOUS

PDF

88.3 KB Created: 2021-06-26 01:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d5c141245c5f5f9810b1403d4616b5f5 SHA-1: aaa22ff2f825a7f818f0ee664efc5082b3c2a1af SHA-256: 877ba26dcab2d931d53088fe484f8ddeb79a4919b7d71adc8c17a0d9a392187e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is flagged as malicious by multiple heuristics and an ML classifier, indicating a phishing or malware distribution attempt. It contains a link farm pointing to numerous compromised websites and potentially malicious PDF files, suggesting an effort to redirect users to harmful content. The presence of embedded URLs and the overall structure point towards an attempt to exploit user trust by masquerading as a game download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://deltagroup.bg/uploads/file/nivaxoduvufadodotaxow.pdf In PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/r4496pu4tjau0m1hthbt047sds/navekamuluderokefukixig.pdfIn PDF document text
    • https://webmenuplus.com/images/file/dulujabemudubujolen.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba75f6f05fc---katakamaxelowamuge.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/udmb6q0a6sp75hlnsg3jv5lkg5/53436392222.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/379c817c3bf8b8f6be0386ef45470436/puzixukidudebolimos.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/5cbbfe3a8045d96945d274c2fb56277c/76647829229.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/ligisi.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e92325c86---44580610998.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/c98c1b2f8d90d38c783a7836e380efe5/nidugusuwas.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/95875293464.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081298ae2d28---gixorajujosiwune.pdfIn PDF document text
    • https://chpcentre.com/files/file/89668532389.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/iovlubcddra29m1d4rcripiqri/41822328437.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/e3be3373af3328b1ba8adea6edf84bdc/54794821309.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/34662552609.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9d4dcecf0---vubilenit.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/8soojh0o7peiedmos47p1dqch0/baxazazurazizizekedizile.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf59ba72481---88212139261.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077eb77eb6b5---wovuvevujagav.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a6fe03797d61a92f442ad0a717bb89e2/88964330064.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/fubostbuaancv0ppdeabardnse/28841773635.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/mabidenoro.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/rabik.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/6knktuft3bgu19satcic6jshjq/66082186980.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///18105329831.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/a001e364b8af4ae3b1d51f7e2239f6db/rukexududisafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=sniper+3d+hacked+version+free+downloadPDF 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_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 17164 bytes
SHA-256: 2cbe0b2dcdf392f9764ccef6439fc6fe7d6c035c0c6edf0506edf65700f41308
font_01_sfnt_off00012195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12195 11112 bytes
SHA-256: 47423bef5d760908d6e48ad682b21b43e36082ba5c0ecc68000cce8d831a6950
font_02_sfnt_off00013b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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