Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aba2bf6d17da9e1…

MALICIOUS

PDF

83.7 KB Created: 2021-08-25 21:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3ba478a26de717a179c76416f7d86b31 SHA-1: 6f24f15d59e2691f6f471ac35d47d0f9099a4b59 SHA-256: 5aba2bf6d17da9e1d1d1fac7a930ec4b0d7dab5cbe792cc817514d6872a58eac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also exhibits characteristics of a link farm, with numerous URLs pointing to external resources, some of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://mp-journal.com/media/file/xuzube.pdf In PDF document text
    • https://landbondcorten.com/attachment/file/541a42803969ca62195eaae1c70dcc2f.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/tofadumabakezexupawaxa.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/696e5ffaedbf906327fa3d7fcafed9fb/rezowopulebusukufusijajox.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/7e128e27d92c794c8c1f3c8fea7728cb/zigevirafavozud.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/30877094373.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a668f7f2d55---malut.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a152e2a5263becca80b59ea1edce484b/51138150343.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/uqr952vtenbd4t256cn4fnlli1/44461394252.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210808214409505980wgzka.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/fezarofakoxuxejojow.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/51f572a49d1a7be6f4289d88c622ca65/gokuw.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/ruledunuwivenodape.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7jhro4qk1ge9hoos1tvtpcloe5/totimezutagonofad.pdfIn PDF document text
    • https://peterdegendt.be/file/87403983420.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608da243245de---purerekudet.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ffec342d3---83428467913.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb117adc25f---salejobo.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160909413044c5---56013230254.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/df7c029e050ec2d8f32c48ca13f89018/82712689669.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021051614135852.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/74d716139698d4a004fcb66a3d076b72/43599752276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=corduroy+book+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_off0000e623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE623 10552 bytes
SHA-256: 01a03b5f8f2b62317dfccdac71641bf765b22e4ec6e4ecbd672606661e52bd59
font_01_sfnt_off0000fe67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE67 16364 bytes
SHA-256: 6ea61806cba3c385c1b28e6a0c073e97caa2cec6540a0a666678ee0a977e2844
font_02_sfnt_off000128eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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