Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e723030ad26c86…

MALICIOUS

PDF

90.2 KB Created: 2021-06-26 02:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9864b8d0b226891fa948cf70c8fbcc5e SHA-1: 8cbe08c23700d56af26863f4aed58591ed7977e8 SHA-256: 65e723030ad26c861bcea0468c3f3eb38dc2a509cf9159c29f5ccf3cba8bc4e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the link farm nature, likely for SEO manipulation or distributing malware.

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 http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a940064224---wumunotem.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/a9c315fa433a0a5be461434c2c93e416/44559249404.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160974dab59077---77173926299.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/4bslfh89r35r62geubc6fjhrt2/voned.pdf
    • http://aliceinformaticasrl.com/user/pages/kulazedu.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb21b30b1c---94593858817.pdf
    • http://cichanski.com/Upload/file/27469681486.pdf
    • https://noihoithanhtuan.com/media/ftp/file/komomobadutivupogozesik.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/nndrq4n90od6aoeu0ph73ck40e/39846086316.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078534994a84---48425801509.pdf
    • https://hyosungulf.com/uploads/file/fevimalezufizegej.pdf
    • https://actor-conseil.com/files/file/sonilarafuzite.pdf
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430235604232708.pdf
    • https://euroroma-bg.org/files/file/giridakurumudulanifupifus.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/c1542fe263b85f8db98d2f3da00312a5/naxarazolemurefitebek.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/086d1d6bb784df7b379d35098b38bf2e/56194758646.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073218adf5ce---8106440912.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f83645902f---99978644378.pdf
    • http://bezagsecurity.cz/userfiles/37823924912.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848eacde32c---30640165205.pdf
    • http://zoltysnieg.pl/pliki_wyswig/files/12529162769.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/9bc33a15128449722b3f387f25a36255/powafigiguviziwure.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098741e573a1---85417195750.pdf
    • https://itchanoi.vn/uploads/news_file/49446413502.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=mean+words+that+start+with+r
    • 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_off0000fda1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA1 16792 bytes
font_01_sfnt_off000115b8.bin
4f537f4f009ac83d36b001d3fd69ea743fef20001695d4a29c23eb66eed4eef4
pdf-font-stream PDF embedded font (sfnt) at offset 0x115B8 10380 bytes
font_02_sfnt_off00012d30.bin
e7af638c93bb820e9c0282222d347f98669ea4c26572090f7066ae491cec4e3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D30 17168 bytes