Malicious PDF — malware analysis report

Static analysis result for SHA-256 830108be1ac4b699…

MALICIOUS

PDF

85.2 KB Created: 2021-06-27 05:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83613b4015fad513223976ba06e03812 SHA-1: c7a4c8bc3876e169998d7951a4df5a18e71f944b SHA-256: 830108be1ac4b6996ae31e22b2605d5f77e7303737a6eaf99f1a08a84f333bb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm pointing to numerous websites, many of which appear to be compromised CMS uploads. This structure is commonly used to distribute malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd81eabb0e0---pogotasazinu.pdf
    • http://daiichilogistics.com/uploads/news_file/37843018040.pdf
    • https://trotusgrup.ro/ckfinder/userfiles/files/ritunagovalezibet.pdf
    • http://bona-agra.pl/Upload/file/54201992214.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16082315fe37fe---mavew.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a360f54e21---66012269585.pdf
    • http://naszymsladem.pl/upload/file/50213846325.pdf
    • https://imotrading.com/images/userfiles/xigavusew.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/e0ab45f4814e78f84ca1c169c92b6264/69143544202.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d469d3debe5---wonijabimabeka.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/724badc198af14757d952849df594da4/repawurajofegunexap.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc30f5337a---95613834251.pdf
    • http://ctkupavna.ru/upload/file/53970068544.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/71054245f95947f64bdbf1aebe9afbc3/mogubawizamonor.pdf
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/ujskep5ivjje08km9c7scc99h6/tozak.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/63170ddd018facdf8895be3981824230/75483364920.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b58ee9a4f3---dewuvorodapezud.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a89519d7b6a---wigavonelogiwisefereza.pdf
    • http://romanakladatelstvi.cz/userfiles/file/kusimowuxibebuwip.pdf
    • http://wisdomtours.net/upload/file/nipos.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/5db60b4e21d3712531b081127f4c220d/xanemujeri.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fa0b5f2c9a4cac5bc3d329ae6bcc2065/bomokujusamux.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/7db6c884cc26f629266c2dbb0c75a91d/12843423395.pdf
    • https://lapalettedesarts.fr/gestion/file/wagox.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=guided+meditation+to+meet+spirit+guides
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CE 16792 bytes
font_01_sfnt_off0000ffe0.bin
199ee4afee953ae903cb9abcab00b2dd26425afb8b3326f221d496b470e96007
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE0 17744 bytes
font_02_sfnt_off00012ebc.bin
3ecf7d3d59c2eb55a973c4bc0452b5490fe3079940215160798f452556596d89
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBC 10828 bytes