Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4d9a28113e6a1d…

MALICIOUS

PDF

83.7 KB Created: 2021-06-29 10:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1acb9109c02ae30cb74547380f227fe8 SHA-1: 1906a4b73dbfe88dba98e137755dc5594c5a0334 SHA-256: bf4d9a28113e6a1df9bf80b07b542fd025ded7e544bdcdb3bc2f300e98a01ff6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external websites, many hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to lure victims to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://oniceh.ru/uplcv?utm_term=monkey+and+the+crocodile+moral
    • http://fygl.net/uploads/file/091941286279.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/pfnb5rad8evinnpij3cs54b3sj/80791038631.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079432b5316e---bavidaliluwoli.pdf
    • http://legalinet.eu/userfiles/files/93420272981.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d245dbdce72---76302156874.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/0703e62a84e78f44a06a696b1929efad/lutireza.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcd8154f2a---mejibumodalifovuna.pdf
    • https://cristalensi.com/public/File/47670926090.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/nk7o48a5j48141auf8qhrdgccv/lofemilumu.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088d20357433---giseti.pdf
    • http://biomassasia.net/data_ed/userfiles/file/87744634237.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/c7a593e46b94fd6816650ace304727ce/vowasumu.pdf
    • https://alnahamgroup.com/userfiles/file/71407791402.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/c3abc0cfdd28e530aac2fa9586f97ece/kisalirinewuxexotam.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/c897ee7fb7d23d803c25e6ca7f9e72c6/vixotexo.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16a0def192---69082359320.pdf
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/rejobadodejuvamegerugepub.pdf
    • http://tafgambiatours.com/userfiles/file/88421625528.pdf
    • https://cape-electronics.com/media/file/50187996970.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/51qrc8a0bheuubjj4u7onvilp5/1931399172.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/91d0a4beb3ee8da88807c1ab8081a805/wimulumabapolibapaworuke.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/31c405140a1f4cbb1744080a7ad9bdec/67266402167.pdf
    • http://jtour.vn/userfiles/file/91958691485.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/4g82seh4pdcg7ibognokrtjlrq/10900024872.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e51b.bin
534ed82fefcd730fabc6af87a7f25021f37de130d1f9f739ffb86d1c96a712df
pdf-font-stream PDF embedded font (sfnt) at offset 0xE51B 10664 bytes
font_01_sfnt_off0000fd59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD59 16792 bytes
font_02_sfnt_off0001156b.bin
4f5f21ea8ebfb66bb9b22f226e24be409685453677a8d653f4e7681a05d65adc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1156B 16912 bytes