Malicious PDF — malware analysis report

Static analysis result for SHA-256 695bcf2187ff4fa8…

MALICIOUS

PDF

86.6 KB Created: 2021-08-23 15:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: dcd1ebcd916dd357b4e59b2412dfba0e SHA-1: c7b48887919390f14301dabb0562578dd642e702 SHA-256: 695bcf2187ff4fa8de5348c5118a6731edb4415ad6511c04ae595c1dfafede95
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. No scripts were extracted, but the structure and URL findings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://rymwid-training.com/userfiles/file/21840919756.pdf In PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f23d6fc03d034a037589b9b6e49d1715/20758380427.pdfIn PDF document text
    • http://weddingceremoniesbybev.com/clients/72651/File/22979075299.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles//file/38754910578.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0797b50d1d---1546075134.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/vijutegafezizokiruzes.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/pasajakonaxokakim.pdfIn PDF document text
    • http://cf2sc.cn/userfiles/file/5375548378.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/13306025964.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c89a4d4973---xedutufojikazagivugubiwal.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/mujalerenesuzozovudarono.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/c6b43adecf969e0e7227df68225a91f5/pufuridubozuxazemizama.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f8532340732---buwivajakubesonisud.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/57533975352.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160705c4f5377f---reguw.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/74324994571.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/89270513999.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/0419d0c64aa3b7071caeefe557baf56a/dinebilivax.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bde0540961---pelapas.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/fidepujupop.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/26849f272f975d3147ce31ce3cb01a62/jutexidefefop.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f72d3df08c---62981879599.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/36036753051.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16090fcb5893e0---78394502848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+old+to+play+senior+teesPDF 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_off0000ebb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB1 10576 bytes
SHA-256: 0d2fe512a83fef7e068946c3194b6d6e4def8463dc3e836acfe6206756d166f1
font_01_sfnt_off000103fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0E 17760 bytes
SHA-256: a05905b0ed54a16fb11f8412ac8bbf1fbbeaca864f428f27575b28ac71ba661a

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