Malicious PDF — malware analysis report

Static analysis result for SHA-256 0436101e4b778fc1…

MALICIOUS

PDF

86.0 KB Created: 2021-07-01 13:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a1d6035806a73b08aee56e7a9fe6313a SHA-1: ca6f6644f3bd141cb5f12bbd139dd1abc7342890 SHA-256: 0436101e4b778fc1c3be78c25f819461982438ffd1395bd5f2e1ffc70ea20fe7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6e3d1b364---luxasuka.pdf In PDF document text
    • http://bigband-ulm.de/userfiles/files/fozedabuduf.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084960321a05---99574282982.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/50439873061.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/6f0a8d8f1920c0dd8a05699ba10dd201/12975287159.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/87386207857.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087e157d072a---jigufojogafew.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/lipesekojugag.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/9728350213.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/iij5sdh9566vsvum9mlsjtlt23/lomodivizapaxoses.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/xobebewopozatifafapexu.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/39ee41f6d0437ab3030084b9b987a282/70396606012.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609d579f3e74b---78292039756.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/r279stj7j1js7lg6ek154o7km4/wolitefetamoxusutadog.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c5188df6---vifuworokonutewuni.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/58594916388.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/depurafovulotofajimebusi.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084331db42ab---poxigoko.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/f520fbe4c776c7838cbdaca1f3e9c4b1/tafaw.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5aa10f271---fizawoxufob.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/203c86db03ed6833765819cc04438357/14661479007.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/1e42e3a0c79402187deba6c27f7d55f9/jesuj.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/51036614911.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ot5hfim2flu47d6d2q04ggg1qh/lolivorizetalazubuxiz.pdfIn PDF document text
    • https://govox.co.uk/wp-content/plugins/super-forms/uploads/php/files/ag74a40369519u42cv3vdenftq/xujugimumuravawabikeso.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/b951abf8be992f3a15e016adbb223cad/57942619846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=international+law+barristerPDF 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_off0000ef1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1F 10280 bytes
SHA-256: e1f982f05da7e8321ee8914f1f64e01b300bac1e82f800b3be2e2f08f58bad28
font_01_sfnt_off0001066b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7D 17004 bytes
SHA-256: e74a6cb0e77da427b6b2897d208b3a19afd0eefb7529a55a418edc311a530dce

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