Malicious PDF — malware analysis report

Static analysis result for SHA-256 1118f3e0622134f8…

MALICIOUS

PDF

96.4 KB Created: 2021-07-01 19:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 028dec82a357b0d53f8a464e2f9cd37d SHA-1: 407293647d5dad83b40a8489ddc166a50fb7f742 SHA-256: 1118f3e0622134f8b2a0a19577470712b13416a8875e3b186dd5f3ec366cd19b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV both flagged this file as malicious, specifically as a phishing trojan. The primary purpose appears to be hosting a link farm designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607d44f3c63ef---rozaw.pdf In PDF document text
    • https://sofupingame.com/calisma2/files/uploads/pizarexurabufikitativemok.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/bc61efe2a017ea65d0a63a09bd5b3740/dogivuzovadefeseregipeded.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc7f6b4a80c---ranexabepo.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0bca7f05dcb9cf162bec25c4d6dc16b/tibusezefofiziwunuzawarip.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8c02d6f39---1755357733.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087233b018cd---34809330752.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/sk34ckobhd2ie8uk1a2giniqv1/69988784362.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/nelapurilobodobigobizij.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/2d2edf4ac0ee45a5ca6fe33baf845c6b/muridonik.pdfIn PDF document text
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/bc58922cc8f3362fc544166d6b2bbaea/22300535435.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/c345c61bece462753d39dc73ec905eb6/kepidezetid.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/dukufusoguzizapeliwelifov.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/3ea4c27ec9425ca044c51b1ddf55fb5e/kozodexawekix.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/xejajevosozo.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/xijafovelavogurinopobubum.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/21140995374.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/tikalumabomivirub.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b80be2342---vokoluta.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e9e50fe37---3152556559.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b6ab7c96---jofokagadam.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/sagifulimukuwimeja.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084aef84431c---11412048029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=puck+and+titaniaPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001184f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13061 17616 bytes
SHA-256: facc963e34733814470704146a4664ea6d5c4b92929c2965e70e3555e52d034f
font_02_sfnt_off00015e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E4A 9988 bytes
SHA-256: 7dc5c021983dd720b8c8799a33702f3d8615404cadec7d077cf36dfdbec12ff7

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