Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f83e58bc81011d…

MALICIOUS

PDF

94.3 KB Created: 2021-06-29 15:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5d2243f9936875d25b744c791b1ef762 SHA-1: 34a10a8d547a1baa23dcb338fdca5f8084240acd SHA-256: 44f83e58bc81011dba67baae007a052eb992d6d723d313cc511c70678c1929ad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, suggesting it's part of a phishing campaign or a distribution mechanism for further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to distributing malicious PDFs or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/a229743cc5bbe0b1f949ffc321fbc1c6/mesafiwoviwadupodumekefu.pdf In PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/144392a15ae5fed4af798f0e17b0801c/vagara.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/gugatoxepikepuwafemuwada.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df6f83d919---regirewefug.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/952e2e984b0091d8ba8c7bdbe36f2ce5/rabobizizuvarapafuvarul.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e4c186718---97049565115.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/qc201bbj06g3t5agrj0b8qj30k/gafezasuxena.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/76216252b1c27428c99734ab35fd31ca/99235398856.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/59049435255.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f7066afb3---97452442258.pdfIn PDF document text
    • http://adainst.com/uploade/files/20210621234636.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/2022445849.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/32976413261.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/pelafidurebi.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/ad7dde70df6dd3b2b047070081c2e86e/nozuxukekozen.pdfIn PDF document text
    • https://icbacademy.com/upload/files/42336405786.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/vemiwevasonobepixuwaku.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/ragenugawamozuwadovu.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/3493404247.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/39pfus61549fo91dqqbho3h2l1/19363327524.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b4641528c---31002880170.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/70378679757.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/28310215020.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e466437455---vilitepurivefez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=command+and+conquer+generals+zero+hour+reborn+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_off0000f1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F0 28284 bytes
SHA-256: 4f80513071944670ae28269fd07a5210eab3b162b23dd228a98c65eb15257d83
font_01_sfnt_off00013721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13721 11192 bytes
SHA-256: 9e2630c9ec4b7fce613b67d44f32603cb21e907e4e714ea21371a8b49f675f69
font_02_sfnt_off000150bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1