Malicious PDF — malware analysis report

Static analysis result for SHA-256 10220389437a91d8…

MALICIOUS

PDF

81.8 KB Created: 2021-09-11 05:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 802e657cd24a4189a34597d9b9b154c5 SHA-1: dfe635f30b9218df45742f67d47a880090a2a7ee SHA-256: 10220389437a91d88d52fe5c53bea7705a77c38b74c0d814b40af218201b7a52
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/161316e0f58e30---38085741636.pdf In PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135b15dd8ed3---66315022038.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/nifivowokakibupuxif.pdfIn PDF document text
    • http://mc-opony.pl/files/file/negeniwatoloza.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/97815771366.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/21136846487.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/zowafilekimekapik.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7db7e77ad---bevulozuwinesoberufunekok.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210902053354_doojrz.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7e3356d5e---9872715322.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/8c376f2af012f3a2772c1a34e81d7fd6/33082321599.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/42971976967.pdfIn PDF document text
    • http://mopron.ru/upload/files/gupuvuma.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/tusedoz.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109031210586578.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/82233796730.pdfIn PDF document text
    • http://nincity.de/inline/file/92473249001.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/nupenokekobuvebovotaseno.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/bomexisisudapoku.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/47984409205.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210903_145117.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/66983689793.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/dexapegezo.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/26003241163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+download+obb+file+for+pubgPDF 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_off0000d7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B5 10824 bytes
SHA-256: df31a89799920776f7a7255a0bdf495b0207c68e383fdf7bd3bff3ed3da154a9
font_01_sfnt_off0000f054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF054 18476 bytes
SHA-256: 5a56d9628b776200dbf1b976f3b04d6de2be501201e3035ba7367d7d7e1aa4ff
font_02_sfnt_off000120f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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