Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1f3295b0162c0b…

MALICIOUS

PDF

107.5 KB Created: 2021-08-12 20:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c46a2739729079f0791984811d585f95 SHA-1: 9c69c253abcf56757d228e2541d597e9bbd215d7 SHA-256: 8a1f3295b0162c0b1bb1ab2927e9c122405d56054308ea9ea6f22bc3d70edadb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute phishing content or malware. The presence of external URIs and a link farm indicates the primary goal is to redirect the user to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ee0gok8h501i3vcuh2ef74rsbl/36381684565.pdf In PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/6b2386bb3dd5dcf3c765aa0653e4ca60/44650654593.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/53677745255.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/matisu.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/melobodejufurige.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/6de3939942ea2531e38ab33b85bd6b7f/vomadanugutunonibedekoj.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/40329081520.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/fibaxovo.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a07a551e7---dinudifigini.pdfIn PDF document text
    • http://wittzumstegfamilyreunion.com/clients/e/e5/e56c03c63d8c9260b12fda9e5e6a3df6/File/kufuwobudasubak.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed63a42f4cb---pevekezuxiratat.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160741eca3368d---56863106700.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d3833fda145---82002955284.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/velivipub.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/66094510866.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16111582bc8a52---jinuwidenogiwifojudoxoz.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/butiwidelufi.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/96183259661.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9278610243---fupavodaki.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8deb391f76---nifezolusepenatimasux.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/89451624650.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/fabaxetakisirogafunizokuf.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cb72855a3---feban.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/6cc8b6dc0a9668fdcf2c8f1e78f1af11/rusaxajasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=miraculous+ladybug+season+4+episode+1+french+english+subPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA2 18756 bytes
SHA-256: fa1bd314a38eabddbcfc74775395533e4757013decf3dc86d17669813781672f
font_02_sfnt_off00016e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E17 11280 bytes
SHA-256: 7592a86833067d9de27d8aeedff6dbd51a2c638917c743a72f11f33c97c40dbf
font_03_sfnt_off0001882b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1882B 16436 bytes
SHA-256: 486ff34aa7acdd45fd612cf649782434502c11a19ff27c48172ee66988a3038c

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