Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b986aa93b2d235…

MALICIOUS

PDF

80.7 KB Created: 2021-09-24 06:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7f7dceb954ba14c7cf614840e1507245 SHA-1: 50cfa443224d748f18bcaf42dc0dc2abf953ce3f SHA-256: a7b986aa93b2d2357df4b22f8e29e6f102f9d5d8e09b91aa67a8f5b2e1099e3c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads. The presence of 'utm_term' parameters suggests a potential phishing or SEO manipulation tactic. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ketchas.ru/uplcv?utm_term=open+world+best+gangster+games+for+android PDF link annotation
    • http://morebricks.com/ckfinder/userfiles/files/tirojejixajapasejego.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/bivegozonuz.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/71334445634.pdfIn PDF document text
    • http://arsvet.ru/img/upload/wufaguveviretokevisibefo.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/38703986501.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614098d6c01a3---jajepofibidekisujuvebebos.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e1b7970e0---mimotopupusobepamugiwaro.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/reletifazajikefebujowu.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/zaromuvufiferepaxovo.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/25044201275.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161456ee9d6ffa---zigeximanulu.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210923050051_565213354.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/69533821901.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/tijisa.pdfIn PDF document text
    • http://askaudit.ru/price/43096130971.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d41ba2d7f6---xigofekex.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/29167238613.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/80329141737.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/pizija.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/xumefadikobarajixoka.pdfIn PDF document text
    • http://hingliltd.com/userfiles/83572698190.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/rurolexizisedudokalasu.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/venipimosagepopobiw.pdfIn PDF document text
    • 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_off0000d13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE950 19220 bytes
SHA-256: 566c6405fabed4c92b464275640c13054bc119f317c8cba6cf3823194f0aaf1a
font_02_sfnt_off00011b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B34 11092 bytes
SHA-256: df1d301e066aadbb9826d372be2444e38018d04af353060df28d6735007506df

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