Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc1b9605908f91f…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 10:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e3e02c47a76ca85fe6a64299a15d9519 SHA-1: cf199e146b9e94644e7ad50e8f556ef887a173a9 SHA-256: dcc1b9605908f91fdb65bfba10f332f35a5df6de3796cbc1e379f884918edfe6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier 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 redirect users to malicious content. The heuristic 'SE_URGENCY_LURE' indicates the document likely uses urgent language to prompt user interaction with these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=maximum+ride+book+7+pdf PDF link annotation
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ea2d7d03a---vubipinivejamip.pdfIn PDF document text
    • http://cissi.it/userfiles/files/66740081529.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/kugavisigogifu.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/6b80a77ee4c7e64a2b20ae730e74bd69/66728315237.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b69b380479---narebunajarokotim.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceac2523db---64989653949.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083942956363---77628570551.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/sonebolonirulitededafuv.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/jasasubaperepipulutebetol.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/243866749.pdfIn PDF document text
    • http://smakbyala.com/ckfinder/userfiles/files/79593371014.pdfIn PDF document text
    • http://ausafe.net/images/art/files/31599587120.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612c7734130d6---3322430467.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/xagiti.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/sg4tc10abe122qhmd0ocsggikq/44933085809.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/wiwam.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/s3eic8vjm388mefep97rtqd8t1/fefimuxuzuguvuzomakudukav.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/1d9e0de0d30314b44c8f14dd1abd50ab/velubudem.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/wuluxokedemenesolil.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16084ed44be94b---96685383124.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/57260538112.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/8651042916.pdfIn PDF document text
    • http://from.ua/upload/articles/2021/06/21/files/kifisoxefukuwe.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/kijix.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_off0000dc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC59 17744 bytes
SHA-256: 821977a2c3beaff581fdc95b32b5709fa403328fb872471ff2bd7916c9fb2ac1
font_01_sfnt_off00010acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E4 10720 bytes
SHA-256: c439578d8c1d128683c6b77b336ad8e0ea895c20eef78d7580833f30fe445cc5