Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3f33f1773be6be…

MALICIOUS

PDF

80.9 KB Created: 2021-09-01 00:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ca6841a801610a9fea919fb59f1a332b SHA-1: 2d0f2a06eba9098e7a04d265c0b5deb5f429576b SHA-256: 1c3f33f1773be6beaa44bcbf79f239965dd5b0b2eaca2b845e177cb934edcaa9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the link farm and the 'Phishing.Trojan' detection strongly indicate a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://gayaarchi.com/userfiles/file/20210708232240.pdf In PDF document text
    • http://kalikraft.com/images/file/9560303445.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/65c10e62a6c84c8cb0d510b257927110/81215667765.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/tusixapuxemuwekibunokum.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/bovepor.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b431c84148c---49157725695.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/fiseveka.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/48835545e89e3311f5c81e429241b656/kezawimarod.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/jvpsmdlcpgrrv94bhl9g426gk5/35866552257.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/kegol.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/22258451721.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16091c7f7323be---76057935943.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/31851564729.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/f0ee31af4eabcff96d4e7f805c7e5158/povapupobumeg.pdfIn PDF document text
    • https://hanul-muresenilor.com/wp-content/plugins/super-forms/uploads/php/files/rp969eilbaiqdopdi4r45s4ehj/53587770992.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ab352q0q0b7if7r506tab8bua1/13776213121.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd8d94dc97---noximirutumufomemidisedod.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/fogakezazetazi.pdfIn PDF document text
    • http://sjhtractor.com/d/files/dumazubuwoviboguf.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/8bf1e08dd80f90e938488de466536d6c/tanilafemavusiburot.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/5102791528.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/72038530719.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/839f09aa360da341c5fe8f61d0da84e3/miwugor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=principles+of+marketing+questions+and+answersPDF 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_off0000d887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD887 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 16648 bytes
SHA-256: 53fda571ba453eb29d0cfb30176a12d9af9c6daf0efa11d28c6da07923dedb40
font_02_sfnt_off00011b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B53 11388 bytes
SHA-256: 0d220cebc37957a2d39778f847c9faa4a73e3851f313839a5a9a53075e3c8cac

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