Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a328e9c879f254…

MALICIOUS

PDF

78.5 KB Created: 2021-07-10 07:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: af099c204d704bbf1852bb722c048361 SHA-1: 49242f1c60f0cdcec28d0ac3d0093ac397ce943b SHA-256: e1a328e9c879f25439feab90a8170a12f797e67f220e34be60f49b730b90ae42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF containing numerous links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://vasantviharproperties.com/userfiles/file/wozovanisuwu.pdf In PDF document text
    • http://wurbs-hanau.de/userfiles/file/91260734157.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/60851638790.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/voxibazuxomalow.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b306dcc828c---98441149731.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/4l9m2gmslghmtqp57tv4smutjc/86254225138.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/qmmiqrmecqlos9no382me0nme0/ruwomonolukixozatofepaw.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/v90t0mgfd7na3k2mkad21g8467/50017010710.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/95e19180d3ca6ba03b226468a85c1d9d/28896039930.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/lutodebanikatuwigox.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/tufurijozabopuz.pdfIn PDF document text
    • http://palami.by/images/file/nodol.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/biwepovone.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/fotej.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a87ad9966c1---33106281295.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/56e5b6fdbfddfe445577c731ee631d60/seviwexagosuzum.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/24935615508.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/303e75a2380816e1dedbd26dcf2e3389/21403507599.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/631e6155aa025654f1522d595b27d4f9/51665863296.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/7dd199981a0f556d3d9fec57fadf0d83/bumolumukamivumilagugef.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/53214731234.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/luraji.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/65197052154.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/7661242171b27bf6097e3bbf7bbca70a/23452440337.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160727b4a50c00---62335468148.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/19354504995.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a3b3d3eca---boxerulamugukigimemupaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=chapter+2+critical+thinking+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_off0000d0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B3 16488 bytes
SHA-256: b84acbcf3dd860413ad3b25e0f2f6e6928ed555f9ff48493beb7953ebb438588
font_01_sfnt_off0000fb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11337 10864 bytes
SHA-256: ebc8ddfef186b60679bf0447ab2d2768e72f4613d6d81024ef4b1aa52199b6e9