Malicious PDF — malware analysis report

Static analysis result for SHA-256 4111654acc7198d7…

MALICIOUS

PDF

92.5 KB Created: 2021-07-25 14:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2019d7b54d2b8be0dc38ef3ad0a401ee SHA-1: 9a7628c0b8e86e644c7a1196af2f9521968adb5d SHA-256: 4111654acc7198d75be366c786a17d65fe6ac747df8147de5414868c070ffeb1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites and disposable domains, suggesting an attempt to obscure the final malicious destination. The presence of multiple external URIs and link farm heuristics strongly indicates a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://canadanur.com/resimler/files/kasul.pdf In PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/rfg4mpd0blm51bo22u2ma8phfk/38762140533.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e84fcfd00dc---musukekexudidelazemuvezo.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/82664439698.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/d22e7e8c172c1cf686ec715d66d5699e/dupolavomowu.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/nezoji.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d709ee086---80498316605.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/d714de9afc59c3f379ac723bbef2de68/86956195202.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608397d733c70---93921469297.pdfIn PDF document text
    • http://vralumni.com/clients/7/71/71e0d721b250bdad3664bf54e70089ab/File/fiwowakinubeneno.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/sakusazozibareribukat.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/62337775032.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/40125944822.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/aa9f5b3e5294eb5237e031443be4d9db/19244544181.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/tovinoritegivido.pdfIn PDF document text
    • http://belst.by/upload/file/17756613193.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f9cac034dcc---zakekilokotefoxodurotujix.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/61243517891.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a378384f704---81850670556.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/kegijenopimapogewul.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d96d4a45f8e---mosafupozilotowexos.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607683399f77a---linej.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/pewogakekoze.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/mojbrg6rh3haotpql7f1el0afe/23039012149.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/cad522e9b7622ceb32843b556160a80c/88752950153.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e1947ae784e8c40fc7b6d419bf783e88/resawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+find+my+roku+3+remotePDF 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_off000102bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BB 17664 bytes
SHA-256: 7f23ad8e4c29551f370dbed420a977c33c70393609a4691fd695f3405da791c0
font_01_sfnt_off000130da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DA 10692 bytes
SHA-256: 4736a413e8fa79f300d7d1946760e577eb364615339d09f4cf248974edce6ff4
font_02_sfnt_off0001496b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1496B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1