Malicious PDF — malware analysis report

Static analysis result for SHA-256 78368144a70a128d…

MALICIOUS

PDF

90.2 KB Created: 2021-07-25 07:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6c2b45d8769533b58e4e7d43d3bb10c4 SHA-1: 26309c4b571c98f8b3b961d0dae5aef39d14a978 SHA-256: 78368144a70a128d6dbaf9289fbb9a9f82f7a484e12211c946e2054a6484106d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to compromised WordPress sites and other disposable hosting. This behavior is characteristic of a link farm designed to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://maraulsan.com/ckfinder/userfiles/files/2237051999.pdf In PDF document text
    • http://ateliergermain.net/sites/default/files/file/91833342327.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/1328f4eea30703bca9698bf907b550e1/61314633487.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/mamafuz.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093daa348b8d---20011161149.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071d1a500083---gokajapuvufav.pdfIn PDF document text
    • http://tyextractor.com/d/files/29764254601.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/8ff60aa0937bb2b2e1880f838a0343af/9952972332.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/57000059667.pdfIn PDF document text
    • http://fini.hu/userfiles/file/rawewudozukefatexogum.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/wasabixuka.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/tavomegizalujapewe.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/61146803896.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/mimiwuzepez.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160862d0861f71---gulagejedazisowewugorive.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/39191758794.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085afcca223d---5841604386.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/28759977077.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/gagowobi.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/dusuvugoxatonijag.pdfIn PDF document text
    • http://scottleddy.net/clients/862555/File/denirota.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/kedomowo.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878f9f60874---70703646010.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/12476125686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+pair+jbl+soundbar+to+lg+tvPDF 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_off0000fb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7F 16984 bytes
SHA-256: a64337be30b278a981a508e8ba0a5cf4660ac3058f091e91c7ead4f441f086bd
font_01_sfnt_off000127a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBF 10948 bytes
SHA-256: 03598eaa9ea929dd5999dbdc18438ed539e52ee53ebaaed7ad347b0ea5d234b6