Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e6341b4fd399dea…

MALICIOUS

PDF

88.6 KB Created: 2021-07-03 09:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ef205d65b0ad5f852200a3be012c214d SHA-1: 88a0a711dd6bf0ca1275e05d4e4d495a4f1b709f SHA-256: 7e6341b4fd399dea5e6b77b0941e84c5571df4d8f9477e255b47ac1ee46b9663
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to compromised WordPress upload directories. These links likely serve as a link farm to distribute further malicious PDFs or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f54dbb4fa---kimotubarezoteperobit.pdf In PDF document text
    • https://aradovan.com/userfiles/file/zutakakexukaruj.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160949fdd3c87c---filuvikofefam.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/n8srlqaktuts44ovs29b8mc394/48056546596.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/bcbugma6pae06hvfto35rov0v1/96005337436.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609b771dac791---tazibebovaxum.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8ae9caea8e1d989807fd6a14d343b981/lakuxebi.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55af620a33---77585517240.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/tobogisifebijuw.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/67705278150.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071ddc55e012---52045019233.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160983c65440c7---dexazisunedazef.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/164ab9367379230ccbc37622a60e9a27/zidebokuzomidok.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/bosofuvewom.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/zoloxadubugafen.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/ed5026e0c3b35ca5f2d84d5987057768/julogevonope.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/f8c13181a8ba5c944790b405338ba199/41370752056.pdfIn PDF document text
    • https://haidangpc.com/contents/files/27511273195.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3d7376e95---43434809968.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/luluwobikamatupuro.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be09204e790---1630654847.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/bivaj.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/d436a9f8a1671da59dcde16ea9a0d178/77576538829.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/da13gqotg2scbelj5k4qbfp3qe/madawon.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e43a9ba10---sedutegujanigok.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb70a0799e---11133154159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+quickly+defrost+pork+chopsPDF 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_off0000f625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF625 17552 bytes
SHA-256: 8bf46aea2d497a4a4e865e336dea3d1c287056b36088bee718414923c8513243
font_01_sfnt_off000123a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB7 10980 bytes
SHA-256: d274f813c0d3739cb8d20fddb0eaa314c6f9c494098fc94ad68e254e679430aa