Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f40115fd9bff894…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 23:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0fbf6a223f46125c55e59a7bf1cc6381 SHA-1: ee9e40ef27db8ceb6dc8670412706afc82aa36c1 SHA-256: 4f40115fd9bff89461c9da191068e422237c9b6af5665a55c0487ec666d1b3eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body was unreadable, but the overall structure and URL analysis strongly indicate a phishing or malware distribution attempt.

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 https://ikansambel.com/contents/files/61774800825.pdf In PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/91340954687.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137edaa492e9---muzaponibiravexudaligerak.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/piwamefipobagew.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/72638431134.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327857be84d---93358916493.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161463a40b9f81---80032178162.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14221918521.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eff8de515b---25981878392.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/42603490183.pdfIn PDF document text
    • http://ladna.pl/user_images/file/tunozajuwolikimukanira.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/13896368113.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/16309240997.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/tudopivosid.pdfIn PDF document text
    • http://skolky.info/foto/images/file/gifamazurefamukiv.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-2/20210902204825132397.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613557db321de---vakidusinovalodepek.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/33988374456.pdfIn PDF document text
    • http://bibikid.ru/upload/46513381588.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/20684313411.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/levatusi.pdfIn PDF document text
    • https://thehouseproduction.net/file/dijabumuwenu.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///55207150675.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/xetejanadigodikufagoxul.pdfIn PDF document text
    • http://bubb.cn/up_file/file/nigerafamuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=can+an+iphone+share+location+with+an+androidPDF 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_off0000d647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD647 17588 bytes
SHA-256: 0defd8a566c8ed6fcf2cf1f01f3b7d8aa94d1c0a7a352cea74370096be4f1b30
font_01_sfnt_off0001039d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039D 10728 bytes
SHA-256: 2d3a2844aa154fae1735eef66834a84a106539a2943823457cddeba51c979a97
font_02_sfnt_off00011c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1