Malicious PDF — malware analysis report

Static analysis result for SHA-256 378b732ca3332da3…

MALICIOUS

PDF

95.5 KB Created: 2021-07-02 08:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f7c0276b7e6205978208f8bf4577ee8 SHA-1: a66959cb1a4e8b26f2f80ff9da7dfddf5d65b472 SHA-256: 378b732ca3332da3bf7264a0744a3cfc8a60f8e71f338bbf1d94241ffbf12d46
156 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple distinct hosts, many of which are compromised WordPress sites or use disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs are likely part of a larger campaign to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/d66f13b4041b81ed0020a77d9157e3b4/tenol.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcd47b3ca7---lakoloraxukipijegavasafu.pdf
    • http://ingmontagna.com/userfiles/files/pajimudomoxikikav.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160af901809767---donenetul.pdf
    • http://barudan.hk/UploadFile/file/20210623011424934.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da81c8b2ea---84446016514.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/3760db25afa5b17231269a6329dd625a/kujumex.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606eab54744de---zupanogevu.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbab43d578---39634052957.pdf
    • https://bookatowncar.com/userfiles/file/19282825664.pdf
    • https://virtualpulse.eu/UserFiles/file/vujuxojosikapetizizuxifi.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16074169bd8d0e---wigewerizimekamelodi.pdf
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/67534064712.pdf
    • https://alshaabcoop.com/userfiles/file/tefidifelevuliwupuzapiv.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/258e9608713265fa8aac8efaa1a5dd83/suvik.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b510ea4ffc---gobimuxujib.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609211f7ba0eb---43089215931.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/860b1e576c3d96ab964504e70ad49e28/64300881234.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099fe8f670c1---17872353543.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/58800697e2f5cb1818b91187b265754e/28090716630.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/08029b0dc0f347f4258294ba123bb06c/31204839371.pdf
    • http://pngroup.pl/ckfinder/userfiles/files/77371505933.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608773fb4420c---52730598078.pdf
    • https://abugfreemind.com/userfiles/file/18285875590.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d5583615c---73639597002.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=can+manual+transmission+be+changed+to+automatic
    • 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_off00010fde.bin
37e176c0ca323dd214251cb1939d6b413889adf4174fa1a44b284af5a2c8a14a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDE 11088 bytes
font_01_sfnt_off0001294c.bin
895a88b97461338552552619fbfaab94a76db0893e8092fc7d88dcd52c40e82d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1294C 17840 bytes
font_02_sfnt_off00015835.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15835 16792 bytes

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