Malicious PDF — malware analysis report

Static analysis result for SHA-256 891c51479290cff1…

MALICIOUS

PDF

85.2 KB Created: 2021-08-09 13:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e27b8ef9d3c27eed8fb9c565780a4769 SHA-1: a62ee5539759d0a7ecd76dde9f1e2b113c7ee796 SHA-256: 891c51479290cff1b6aff1f7b171afc8bbf31b8ef070a8a54cd3f0015ed825a3
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload directories or disposable hosting. The ClamAV detection and ML classifier indicate malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5579

Heuristics 5

  • 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
  • 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://assignmentmart.com/ckfinder/userfiles/files/17119612621.pdf In PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/be2a676277f2691885f8bc7323bf5cc6/dupudirunorefizerupaw.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/kugakopitibusasez.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a888e0ba2---7023327930.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/gixedalezovopu.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f103827c08---71971548798.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/32736768043.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0625cb066---notifux.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/risoxubuwatajepoxajig.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/14034316128.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160833adc4ab81---36864373687.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/723975e42df3792288ab1f8641bf363b/sowetoxajibagaju.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/ropopuvojulovinafunakafex.pdfIn PDF document text
    • http://azizolace.cz/images/file/rugepuzasaranupemojanutox.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/peliviriwiriwofoza.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/zofoxikufojukategojivuxa.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/f7sndvmr1n3vvntraqg8hvfgd4/xotivuzuzodisarudugu.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e38387db8a1---lozonimumiwafilen.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/81d31eb15fc22bc7bdb4588426f61b32/71090739053.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/zafogafipakubuzuv.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/2613949391.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/80bf36515f70f8ff613c1331834b1075/gimuk.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/zavijudefav.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/gabonaduvozuxuzaxa.pdfIn PDF document text
    • http://sneedfamilyct.com/clients/44919/File/foris.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=need+for+speed+underground+2+download+macPDF link annotation
    • 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_off0000e431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE431 23228 bytes
SHA-256: ba8a1dd787a1081b2592dc8b8c27c9c9b79ade7a6d53bb72d545dae386f958dc
font_01_sfnt_off00011dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD6 11056 bytes
SHA-256: 7bccc1e3e69964c61e7c548e3c20ea4295291a4970a01496e9efb4815973ffc2
font_02_sfnt_off00013787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13787 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1