Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5016b817e6b129c…

MALICIOUS

PDF

82.9 KB Created: 2021-09-06 14:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 004559c5ef61e0e41d03033d74c8c5c9 SHA-1: f64f57ff598731a91ddea41e44d777e25e47117e SHA-256: d5016b817e6b129cb4a8e1c8630287da3e2d3f7f61d36be52b18389bb2c57e70
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c8899699c8---17715817221.pdf In PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4bb554ea3---98949196270.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608461c6515ce---48745411954.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/13337192888.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf2044e054---98859075260.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/40409098728.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/64045906000.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/dizafusodev.pdfIn PDF document text
    • http://nietegeleuve.nl/cms/files/wowiziwibosew.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/dipeviwemakolajobibiduda.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/jiludujunosorenu.pdfIn PDF document text
    • http://rcot.by/pics/files/rojak.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210813_99A767CF6FC39A5D.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/fivifitatigatujili.pdfIn PDF document text
    • http://fpole.ru/sadm_files/gekubemufowaxawepovivikig.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/fonifobolasimowerajek.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/3278aa61fbb36a51343cb1f65cf428fb/88350295713.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/katogodewebemadujob.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ipsq9mjhd0qbhtm6v1abimvrn1/35345466670.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/99232185999.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c88a430019d---daditememez.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/b483318416662e281780fa45a3d39b15/badogasininifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ctet+answer+key+2018+paper+1+pdf+downloadPDF 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_off0000d814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD814 11224 bytes
SHA-256: 2d1a46d394e5c553305810a1efa3be12db3541a3a9cda44e6e5cc4dc33487444
font_01_sfnt_off0000f2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD4 19020 bytes
SHA-256: 5d90d9a488087e4488023926f4ce590a07c197fa1ce9041eff07653cec4b01ef

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