Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11250413293dc31…

MALICIOUS

PDF

95.1 KB Created: 2021-08-12 23:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b84bede593fa9e30a03f08823c29a34e SHA-1: 905718bb79ef99704ae3947eb3bae1452070be4d SHA-256: b11250413293dc31d39b7bebf1467d9bf372cfdb9532bb45f06f209aab3c90f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The 'SE_INVOICE_LURE' heuristic suggests a phishing pretext. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities or the delivery of further payloads via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://homelife-superstars.com/image/files/rekuwo.pdf In PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/d2d82acc718f3557f6b96462e5b9122e/lobimirisofumebi.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/womipatomozaripek.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/wolilupiguxizekamof.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/9824271166d08b4a1ffdaa75eaa29b8c/fiwudojaxovolinalikuduj.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/emmvir20qaqhpkddf8i1ulo85e/53390490193.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/1653c4691233c770daa5a545fa34bc09/wenutovipiwa.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d5b0b32258---71313878918.pdfIn PDF document text
    • https://retta-bg.com/userfiles/duliketekebofino.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/9d8kuq65jd7nlbd50ne7p00r8l/gusuwetupejexemafizavo.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/m9ojfpje6cqgtb3gpbqs9kqojh/31893156532.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084a957df7b9---tipusuxexoxiwusalegipe.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/482f9e99c51e66209afa0e7bf7d2be6b/rajotupuside.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ac4782041---24071380587.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/36854527910.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607de74998171---58779206917.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/95011886674.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/latimu.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/wokuminumu.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79bd3439a6---28551107577.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0140da34d---4300639955.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/lipapuzovugapesi.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077676738a75---kuvit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=small+business+start+up+loans+bad+creditPDF 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_off00010dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAD 17196 bytes
SHA-256: 4208ff361fc1da43698284d55e9b3a5fa2c30d6db98c0acc82dd13449a47605e
font_01_sfnt_off00013ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC5 10992 bytes
SHA-256: 3fd504c22e022086d5543bb049265416e1eab0327d9ffd11998e203e29da0688
font_02_sfnt_off000153ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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