Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27a083a9f26f21a…

MALICIOUS

PDF

88.1 KB Created: 2021-09-01 00:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ec7968662c96799ec9a14e7d88833e4b SHA-1: c76a93933fe84a5620df13560b9f65a39591737a SHA-256: c27a083a9f26f21ab78f27a9b32807b6c5a0a3915247b3d432c89707ce013bed
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to link farms hosted on disposable or potentially compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a link farm suggests an attempt to obscure the final destination, which could be a phishing page or a download server.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pixomot.ru/uplcv?utm_term=pub+quiz+questions+and+answers+funny PDF link annotation
    • https://m3csrl.com/file/vijedivukamenomitalata.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/4799177854.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210610160724.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/81588205451.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/pofininubaxotudavuzivetuk.pdfIn PDF document text
    • https://viticoltura-enologia.com/file/11526999853.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/jabunudexisejilomivaj.pdfIn PDF document text
    • http://icwest78.com/clients/67591/File/tebadodolivolumada.pdfIn PDF document text
    • https://fond.ru/userfiles/file/towotupejorofedafij.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a29f14a3061---79834127518.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160712b510028f---97234529159.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083eccc798de---pezonojusosusepofot.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/40051651059.pdfIn PDF document text
    • http://shophouse.info/images/files/xikikeko.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160720c120b770---33592410588.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/48339439349.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/fomisufinijelatek.pdfIn PDF document text
    • https://keongracun.org/contents//files/jobit.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/zemukukojovezonipolad.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/77353623256.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/56540590693.pdfIn PDF document text
    • http://armanetti.com/images/66922195563.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/solod.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/vusumezofonixasizifu.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b436c14f549---46332332810.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_off0000f17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17B 17872 bytes
SHA-256: 9ffd9ec2251647915fb9ecbf4674860fb831d6c4d6a1686d52aa8b25acab4425
font_01_sfnt_off00012025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001383c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383C 10948 bytes
SHA-256: a5ee4a38fe008572f4dd4aaef05d4ef01afc7c7d4e17a7f2be6c7e9c9ba104b9

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