Malicious PDF — malware analysis report

Static analysis result for SHA-256 149d166e2356bcc9…

MALICIOUS

PDF

79.4 KB Created: 2021-09-18 21:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ca729584ec91c09f6ba41bdd373667e1 SHA-1: 0a0b9490434bd6e8af602b1330f2c235ae495980 SHA-256: 149d166e2356bcc9815d0055afebab6ea0ac572d12daf0e989f8355a498e7efd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which are hosted on compromised or disposable domains, indicating a malicious intent to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this document is designed as a link farm to distribute malicious content or phish for information. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://allytemp.ru/uplcv?utm_term=android+otg+compatible+devices PDF link annotation
    • https://sandipkumardutta.com/ckfinder/userfiles/files/23257641806.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/57562834683.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/popoxeku.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/lomewuzixatebi.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/53597353377.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/torexigufakev.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/vezinadewurozofebaj.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/vijivewuk.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161449828569b3---51282732090.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210907_173132.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/61420135921.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/bamerasotojomef.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcf63d2805---48586563975.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/44403310894.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/melilulupoxuj.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/51815470461.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4d6b55edec732612804bf6ad3e6d6e7f/bojasagapapivutiw.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/32138243516.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed83415b5b---gixovekamanixakonosaxira.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/kupilaneka.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/wowasidutukoletegudawaj.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa6839424d---wawuwiturimufiduluj.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/lokaxewavexanifuv.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_off0000d0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FD 11044 bytes
SHA-256: dc2959b53675445ff00ab49b97999f48e3ed17f3c336ee0f1600875a19cf63f6
font_02_sfnt_off00010248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10248 17524 bytes
SHA-256: ce15d32245d26e16160a468fa7e0622d9a78f36803c24bc56b0aa4f26c57d86d

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