Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc06a8fe42b4909…

MALICIOUS

PDF

82.9 KB Created: 2021-09-05 02:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b701f90f34a637ce00681db2e3cc3d17 SHA-1: 7602a55e013d37e64acd34a010f9afd256562a39 SHA-256: 1fc06a8fe42b4909491026f5dfa9dd66db4950fbe7fa83f61d4ed6c4391a8233
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document impersonates a cloud file-sharing service to trick users into opening it, likely as a lure for phishing. It contains a link farm with numerous URLs pointing to other PDFs hosted on compromised websites, suggesting a multi-stage phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://cructi.ru/uplcv?utm_term=pdf+editor+free+download+filehippo PDF link annotation
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f815e06069---35473637225.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8798e34824---34016067782.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/tipon.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/q3gs70fh3jqkmv6rlqm6mhalr4/debagutupefifat.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/424005dc893aa8ba80741d401d09675b/57013850574.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/347287eb696f26ec22b5e41ae10637fd/16479946256.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/67233980555.pdfIn PDF document text
    • https://digireg.gr/upload/pixapamawu.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/kanagutafaraba.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/8b6e5852bb9ba9620a52895e554a49cc/kavabilizu.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5edf070a5---pixur.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160984e2484b6c---sonexenawipal.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8406dd835c---68675070622.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/7a85973e9bbbb0fa3e95c89624441c3e/47125854164.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/kuvoja.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/bogapegoteno.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/89148769906.pdfIn PDF document text
    • https://citytrafik.nu/images/file/piwifefurefimizujat.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/63f352a92fae70d0135f5ba7d83831f5/19439512506.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/46626854633.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/tbucrsv70k487r7h2004f2mrvh/65763944086.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf37960883---58551361944.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/eh2ibep29j0u9ga9ppi7g1hnep/22532339539.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160d91ab511a50---76881976065.pdfIn PDF document text
    • 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_off0000e0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B2 10516 bytes
SHA-256: 6113b3994eab1790fcb9fe477d71a705b1ebdbeea21fde5647475bf255245dd7
font_01_sfnt_off0000f892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF892 17332 bytes
SHA-256: 524d47f2f529c96065d99de49e09a223e812ae87d7b2d614c684190fa3fb8fa8
font_02_sfnt_off000125b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1