Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33982141345c0a1…

MALICIOUS

PDF

86.4 KB Created: 2021-09-03 17:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f438180df809647f7b58465fc6f5849e SHA-1: 36fda4189f8025ed83050a8e52732b7ef13ed22b SHA-256: c33982141345c0a1c305ab5088e07dc883982cdf8b34d5b332dc35c65e73ed09
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the presence of a link farm on compromised sites is sufficient evidence of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/ae060c9273051b0f9a575e8ad5165657/labisubupolazuda.pdf In PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/653a6f301ef47b4cee36fabae56227d6/vufadofebewizevizikukixet.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/87335295083.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/3juucaql6dt687llnma0mlaqsk/15084818186.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/ba465255204e9551956588ad7dc89a96/25026970517.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/56eb3d7e5218f151cae604e34bb8c966/13761114041.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/7117370738.pdfIn PDF document text
    • http://asid.rw/userfiles/file/93210462930.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c76e23f2bf8---79386548226.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdde20b88ae---11019141324.pdfIn PDF document text
    • http://apple888.vn/luutru/files/13781519213.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/96452265979.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/n4rq6rmnk9k1kojatkeipd94b3/feradabav.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160897018b678a---rudetavobazifuravur.pdfIn PDF document text
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/dapafenirowojikewexuko.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/kuworoko.pdfIn PDF document text
    • http://beiks.info/public/file/panefop.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160957a6a386c7---3431380106.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/12920724292.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55bc539a20---63646809687.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/45722541785.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/pikosidopamijiv.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/89268178907.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/93562951593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=programme+genie+electrique+pdfPDF 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_off0000e930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE930 19016 bytes
SHA-256: 7e0fe41ed187cb3925baa63a547efa1c89900d4cee73b193544d6bc1d8c4a171
font_01_sfnt_off00011b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B20 11040 bytes
SHA-256: 278f1d40b35fa2c3a5b52e1b30359dadde4f24240228981cc8a7cc16d2e469cb
font_02_sfnt_off00013448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1