Malicious PDF — malware analysis report

Static analysis result for SHA-256 8acad3520b7eead9…

MALICIOUS

PDF

82.1 KB Created: 2021-09-22 23:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 535e628a61fb6379d3082bf6951f73fa SHA-1: 5691a74206fc0518c263ea987cb63d33db1b27c5 SHA-256: 8acad3520b7eead9868255a7a7e857a0f801cc56614b27724e7662df1d86dfc2
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this assessment.

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 https://archism.ru/uplcv?utm_term=beauty+plus+photo+editor PDF link annotation
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0abf426bf---pudupafujavu.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/10209585236.pdfIn PDF document text
    • http://yejida.com/userfiles/file/50242625484.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/2649206405.pdfIn PDF document text
    • http://mayjack.com/upload/files/jizubuje.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613effd35d415---jubujivaripijizuku.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/ac6dd1a2eecbd0b5b62ccaa062b21dc6/75407804011.pdfIn PDF document text
    • http://htwy.com/upload/file/75368750721.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/sizeru.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/54892860696.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161344ea79392c---xoxesovuxajatese.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/29562191140.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/lawipoximuletisarib.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/66472226352.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/71049244600.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/ratojepizagibepimoben.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/wovigixavafik.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/75811495182.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/bomilokoredikutor.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210918215901.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210916044852.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161342ca347c08---72368177970.pdfIn PDF document text
    • https://jjpremiers.com/files/zapotekefuxosuraga.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/vadopuwizef.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/98291317323.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_off0000dbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 10652 bytes
SHA-256: ae2c6fa748d7e23f0b30bfb25ff8b5db2c5b16c5c2035b9a3fe20f7746db77cf
font_02_sfnt_off00010c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C79 17764 bytes
SHA-256: de8f94849df609b55a65764e09a1be3c6615d0bccce0279b8d6ab116635fec19

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