Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2738e7f2a276ab…

MALICIOUS

PDF

112.2 KB Created: 2021-07-18 02:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c77c4f8c508c3876578f0c79ac1ebb88 SHA-1: 20d5a7eeefe39015a09895ece5967cda29119a58 SHA-256: 5f2738e7f2a276ab038069d62e74569b422330f2d3b53ca6f032b4213d23a353
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body is heavily obfuscated and does not provide clear textual lures, but the presence of a link farm on compromised infrastructure is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9664

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 http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075010521277---36593093869.pdf In PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/neterojetuxozetupisidaw.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/67435354254.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b2aa45e1bcf---zovap.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160885c35df9ec---44084100729.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/68879184406.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/ad73f7a85bcb62aab09c66e7042ddc24/toxiwudamajuxozeligakul.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/d15b16d1e6424e06334718882769b7e1/gatekufe.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/gtr740vgs1bnujs68pl1mf5ego/zugovulaluzisoruz.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/9e87493381683b719a9e4761aa8a8129/womajoxubevopepojosutesi.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d72625d91---kereboj.pdfIn PDF document text
    • https://dm288.rs/slicice/file/jeputuwakatefuzeke.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/f834d95a49efefa2efebf41f2a0bb685/modosazijefosudujot.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210701205605_mt7wgn.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c07b3f3a467404b8e20d6d96f2f09563/lukijokupupulamelerer.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b813765f6a4---69785016082.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160949df503b78---fanun.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/869849692.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/62065710240.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a7b7a3da3---dowegamoduk.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/80611472824.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/1ddb7e7dc19c317dc22d71d29ef9ef83/govalafifojudiga.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/e9m6mgreo0ba38mjarj0fa4i3s/97184786514.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/18950402224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sonic+chaos+apk+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000126b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B6 18728 bytes
SHA-256: c92ce7cd62147e9a7afea94096cbf0188e35cd43bcb4e799f3cbd0a5df6d4b48
font_01_sfnt_off000158c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158C8 5352 bytes
SHA-256: 57ae47399e92e4e8081d681a0bd1529f48b48fe9300e34ad2515805f345dff97
font_02_sfnt_off00016cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CB9 16276 bytes
SHA-256: ef858b01719cec29ba59f81a977f79613a1aab7fbc1f32c2ef09c5dd0d876d7f
font_03_sfnt_off000182b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182B7 10532 bytes
SHA-256: 399fca9dec322070d4ef9ea037ebd0690a8bae0d3fe52b23931d8df2fa282d49
font_04_sfnt_off00019aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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