Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7944ccf3aa552f…

MALICIOUS

PDF

94.2 KB Created: 2021-07-03 14:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a815819f1ef91c4a9f44edb760d23484 SHA-1: a7910193e10d7cf2961f10ff943f853cf04d17bb SHA-256: ca7944ccf3aa552f5ec9a1eb609aa728d39b73181929fff29d04eba5c2329591
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The document body is unreadable, but the heuristics indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://alutat.com/data/file/jaleja.pdf
    • http://hasyo.net/files/file/wavakekopef.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b259e6033fc---benanaxeguv.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82e43f04f---xopefefiroxovevix.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f4e03f86---4428805603.pdf
    • http://anandtouristcorporation.com/uploads/duxebowefakijonubof.pdf
    • https://superpart.com/files/40146461931.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/250b7fafab0584fce23c6238fa84f145/wezabotajevul.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099f6f1a421e---megawu.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e1e2b60b7---57603978506.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/71345d81682b79a0e81369b73c8b9789/dimevanenano.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b971169b520---6161584384.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/523a02471993526c0ee5d03c1cdebaed/26539236172.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2baf95871---25536416067.pdf
    • http://mousike.it/img_ins/files/desixukofew.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a29f914ca---99329387001.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/014f7c203f4137e41a160678f4eb423f/77772125683.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160845c6b39a5c---jajabajunuzasubafo.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/42f763f1d6d8521812e0fd4c27b1ca4b/85917562477.pdf
    • http://blpest.com/UserFiles/file/77646431417.pdf
    • https://capecoralliving.com/media/file/mejolavunakonirudusibexu.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608359bd9b0cb---lutikukitu.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/98f48e084p5vljsi1ts02eijo9/95849053431.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/8t9n01cr7pi5cvqcia5l2lpq60/pevewilelejobam.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+you+create+a+programming+language
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3ad.bin
99bb40d080c90c823dec8fe7c52cc5c6be0b722a73cd63d02979de111a5b7814		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AD 17460 bytes
font_01_sfnt_off00012160.bin
439f91fc52918ec11de7c10fc66f42d556e3ca0baf24f0cec7590a9fe4e8f18d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12160 16392 bytes
font_02_sfnt_off0001378e.bin
93ccb56544b2ddc539fa19b1bb40f22fbddc0bee26012c8ad15fdf3aeae4fb00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1378E 10980 bytes
font_03_sfnt_off000150d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x150D0 16792 bytes

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