Malicious PDF — malware analysis report

Static analysis result for SHA-256 899bcb29a67a2e5f…

MALICIOUS

PDF

89.8 KB Created: 2021-06-29 21:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 616c6551ba412d8681ad5ef7a992d4e2 SHA-1: e2ca84032cbf69b9f20079fbba101c6c082dc777 SHA-256: 899bcb29a67a2e5f761acc0a5f94faced1bc7fa149fa320a5a5fb1cb6b9c067b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress sites, forming a link farm. These links are likely intended to redirect users to malicious or phishing content, a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d31997b7ac6---90752182545.pdf In PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/87c7fc24f5f77ea77984cdc2531fc409/xinidagusilusi.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/4fe721a47d3c324dbfc4cb44059881a9/baseterasuzarujo.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/3863adb49b1199547fafe1d706cdbba4/56571166499.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/9e43206385e9d87f6cb259b9b9f012f1/24105172438.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16096304d417a9---pubusudajekom.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/gisedagalefuwa.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/508d68e1f18f003dd87df88bae437226/xosanaluxidikelug.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/91192793467.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/78075090571.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607287db92694---8008355930.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/8ba9303f96968f379a7d92f9533659d2/39965535638.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/9f2411523ac6f9784342f8f510b86d2f/fogujibemibu.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4783c726d---35169928523.pdfIn PDF document text
    • http://poolprotektor.com/userfiles/file/56155401829.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609265875e4c8---83884936808.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/dogelawux.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086081c00205---1953368087.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/10372477931.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/f48c412fd35962a7924a5cca19b7d60b/vadasipigusofi.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/vh9muivteothlvfvdbspr0diae/fimujumofitoredufa.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/45974687843.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/59286354670.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079c108e5574---30705189745.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/pezuzixafaliniwufatazozir.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/43240741430.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/0b615ccdd7cb5644b1e4b1f03e9fa2c8/zapegesumuzi.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ac7f2c016---36317475218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=converting+units+of+measurement+word+problems+worksheetsPDF 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_off0000f9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FC 11460 bytes
SHA-256: 558cf4d17232272c3de0d0868ac67e1dfdcb8887906a83bf1239c71615b11050
font_02_sfnt_off00012c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8B 17148 bytes
SHA-256: 948672d324142860331b8b19fe6a6edfcba2f8962d2fcb3d1d7961fe126565d6

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