Malicious PDF — malware analysis report

Static analysis result for SHA-256 028a8f32f414d796…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 13:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ffa7e0182b80c174af24ec9a1df234c8 SHA-1: b7cf8a15f7750fe1651ae2ae7ec7bc6f6c5a307c SHA-256: 028a8f32f414d796c52ab7c29cd2a2c7f15a8d5bded1df8db9ea7e5c6279d057
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JS suggests an attempt to execute code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed46216a5f---nitulokemorifosiworanabu.pdf In PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/zuxitulepesirakamer.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/52255115244.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-4/20210904052050321019.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/91406309091.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/subeka.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/vakose.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161308d93775e8---rajesimoredopelonu.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/bibuko.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/bomuribusejixanagumovutes.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/72712492042.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/ruregiv.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/fagij.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/tipujelaxuro.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/83982257703.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/bokufisiduzax.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/90103735411.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/sizepuwituditorugug.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/bezutun.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1b5a36cfe---69824140996.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/kitukopebeti.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/levita.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210918_644A1851FCBCAEE7.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/61436e39a0be1.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=punjab+nahi+jaungi+full+movie+onlinePDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/gixulazetuvikesum.pdfIn PDF document text
    • 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_off0000da4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF260 19012 bytes
SHA-256: fddf77ca2d158db5fa350cc919e242a4fc8009096c87677baaa0abb671ab97ea
font_02_sfnt_off00012432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12432 10732 bytes
SHA-256: 1555017307b12f6d22f52ac3e4d0d79cfae5712db50309fc62a8ac3646ccb3eb

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