Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7aaa690e5c71cd6…

MALICIOUS

PDF

71.2 KB Created: 2021-09-07 21:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0da97296b8cdc20d8cc7e702cf3263bf SHA-1: 5a5dbdb431bb690941bbac1b7651883f2d03574e SHA-256: f7aaa690e5c71cd6eaa1b6837eac333aea4243bf409f8305381cd71ee47c8226
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is the primary mechanism for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://csom.cz/wp-content/plugins/super-forms/uploads/php/files/c3c5e3da1de778519118a1722083c741/sixapulunurivun.pdf In PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/0f7a788c91bca491a858ca1971f7aa24/59201353179.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608300400abae---bizekexitifibomagofu.pdfIn PDF document text
    • http://alkanboya.com/files/file///97865093388.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/senekux.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/96847307581.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/aapv6padboteasg65o6rk5cv1l/nejoraxerap.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/podajupikizujujanetuja.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/l0offj29dcra0ianih7fib6nb0/penanodotezadu.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/gedonodemukiramuni.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/begisajabiturugi.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5861018ca3---pefopadofisipazimo.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/zalaxomalimogifuriwiwut.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/98610663147.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/15506834812.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ee70d7235---kenivogizovujuwulefosodi.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/rifujekorigofu.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/98393991023.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/41995491857.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/0b6b190f84235a40bf03727b95dadf86/32542056472.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/92793079264.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdc0e95ecc---najivenawuvuxularolita.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160e434b074f89---90063273284.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acdc5b339d---dimexudufatunoduzu.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e0ce1d6cb---55520372422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=manually+change+legend+labels+ggplot2PDF 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_off0000b3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF1 11068 bytes
SHA-256: 0a576c047ae514cbb3bd379c3a2c9e65916ac35d8ea3fecfea4e89eb8316e4e8
font_02_sfnt_off0000e562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE562 15848 bytes
SHA-256: 54e9b9daa12cd3d99d89bed03c2c9965354530ad8e276267dcaa767975970e0d

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