Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc5713ff96cb721…

MALICIOUS

PDF

87.4 KB Created: 2021-08-18 18:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3289b6e93cca84b3721e32c5892b4655 SHA-1: bf9747f8ad3ff35ea3bc58e04c87870a9ee40c66 SHA-256: 0fc5713ff96cb7210f4f47e37b4ad5407fde5b878aac6cf2bfcb8d9354e2c32c
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous links, many using UTM parameters, suggests an attempt at SEO poisoning or directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/d0042no6gb3950s7cn9ulcj9gi/22427010638.pdf In PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/69620483156.pdfIn PDF document text
    • http://sharise.net/Uploadfiles/files/96825953555.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/892lah3pvkggqr3bdi397f67jt/wiziwazenunibabeviposageb.pdfIn PDF document text
    • http://zuche0551.com/upload/file/96539584408.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/cde039d0fe978bbb2f5d2db87d6253a2/zorigekijexatiroxigir.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/306d0e8a96870fa1041fbb0b0d36cb55/68081338734.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/buneri.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/tq28vrbmj95u9403quaeervmus/fugufef.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/16702332755.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/xipesivel.pdfIn PDF document text
    • https://schmitz.cz/res/file/zibunatotebabubonutaru.pdfIn PDF document text
    • http://0930actress.com/files/files/vobopiwuf.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fda136c321c---30210369973.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/9abedd3337d0b747c2c32ad094f1a6c0/81569851182.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/798020598.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/2153911811.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/45948985663.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202108172356593163.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/josefabuworulofigiker.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/61231979968.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7d1f3dc36---30807272791.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/riddla6g2kbtlspeae29k6lrgn/42657065480.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=molecular+mass+exercises+pdfPDF 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_off0000f0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 10772 bytes
SHA-256: e15cb10f211dd0f2fa724b4dd4f984754ed19fe6ee4cb779dd22608126e2db2b
font_01_sfnt_off000109cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CB 17640 bytes
SHA-256: 56b6851cbcb5b5d895a9769142e1430550526959d6504819daa20c6d094ade21
font_02_sfnt_off000137e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1