Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f64a11662672dfc…

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 02:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9c80668dbe38f7b018fbe23238a5138a SHA-1: 78428851367767de0b985099c75c646be6e5ce9f SHA-256: 8f64a11662672dfc9c8eccc5810691bd7a0237bf4f3ac5c44fcfa27d0824f46c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nyett.hk/uploads/news/files/44584935060.pdf In PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/ccb5e3a951a699d604347cb38e1ca3a9/bafiwuzo.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd40ecdd3a---99210243271.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/64450880183.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/36576782504.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/xodewovomefukujorutapenam.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/21885235244.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/86157866048.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/wopavolekil.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ji8mtpuk43aul00tlvc19ct626/9506398637.pdfIn PDF document text
    • https://music-group-store.com/upload/files/pegidotamudinotexuvem.pdfIn PDF document text
    • https://doitoutdoorz.com/file/LWbbpwat3OlznBhA.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/86663432160.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6134C4D18A28E.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/7shb7bcfcjcud4b6e6nurjph4j/76505725509.pdfIn PDF document text
    • https://kaimano.it/file/vigodusovuxuxek.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/65151132491.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/pegulo.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/80909564800.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/misuzu.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/vupiwowaligabasi.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210920101922.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/zezavatamizo.pdfIn PDF document text
    • https://jck.ro/userfiles/file/zojezifezivedotexig.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/8854156080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+webview+window+printPDF 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_off0000b211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB211 14888 bytes
SHA-256: 1ee80c56d5d7cf20294f1ee4f0554a834b4829576c6fc0b39fac26050c092c2b
font_01_sfnt_off0000d796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 10284 bytes
SHA-256: 7b5f1346b3080277f7b1c42e393fb59ed972edf8abd5272c19202c28ce9e9aa6

Open this report in the interactive analyzer, or submit your own file for analysis.