Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4110443a50b4e3f…

MALICIOUS

PDF

70.1 KB Created: 2021-09-05 22:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: aa64b8b62f048cbae85b92e9b17253dc SHA-1: fd9cf4c556bde3d9cb912cda82b744ca8c624436 SHA-256: d4110443a50b4e3f5a340f830f706c1e487697e6b0aeb8c3dbfa8f965bc9e8f7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, contains embedded JavaScript and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://ksklinika.ru/ckfinder/userfiles/files/80902304451.pdf In PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9266f1432---zenowawefebamo.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/ralakaba.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/8b9s8ev149dpuoe3hgn4scm475/41460871040.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842e4db23c5---83755026573.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/bavipobinimiduma.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adbd584a9a4---12958283621.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/kejotuvatisip.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/dibopanurumonoro.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/42440381019.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/bafevigexaludutenin.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/ccc2ef57df08aca3daafb18745c21b9b/bojoli.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/5cvi4cj4ivgua5c7j4usngtm96/fiforedeviwosigobamafuf.pdfIn PDF document text
    • http://retailcop.ca/files/12570038541.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19c9892da6---diguzuminenakevejusebobi.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/g3e2mesj8l472u0c5m76fban0u/xezebavituwewagokobuzov.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/40f14e33ca64f07ca3c01ab46d23905d/zilusipawekoriwokodaro.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/k28jeobvl08ng74nfar1gh42q6/54348856254.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/melemekalimugixapitek.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/207e145c7e21537237f0250496aaeea6/54597541104.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/somudagunukapotajobuba.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16089b2624f926---14482611675.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/tiwujibofonilemabirufez.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/biregodakugasa.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/68135884987.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/70006320284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=simplify+fractions+worksheet+printablePDF 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_off0000b511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB511 14396 bytes
SHA-256: 5051a915b7c9e7f45c908f7d32e4001401b55d43118882821bccee30207ee597
font_01_sfnt_off0000d8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 11252 bytes
SHA-256: ec7d590039495e3be4b9d0d28f14d6ee26e9b93ad2af688e6b98d99bcb7cdb3f

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