Malicious PDF — malware analysis report

Static analysis result for SHA-256 71708dd5977ba6ac…

MALICIOUS

PDF

85.0 KB Created: 2021-06-28 13:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 723124d26a8230b18419d677b993f674 SHA-1: 404c4a32095d232eda583944c0a496e460c89aa6 SHA-256: 71708dd5977ba6ac0eecad6d8277642b85d311cda683e0d558cd7f40273c3590
156 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, indicated by a high number of external URIs and link farm heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://nomylo.ru/uplcv?utm_term=tell+us+about+yourself+sample+answers PDF link annotation
    • http://cnmrobotics.com/files/files/46157297277.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b813e3ce92c---75246137384.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/ed442066dc3a82c5b84505adefc459c1/33127283703.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881c0021e5d---potoxibenutonekivo.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1607e47c5033f6---xefavuni.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773ceb8482b---kokuwilurodimamanojul.pdfIn PDF document text
    • http://hnspkjx.com/d/files/nolumobuvijuruxigixivaxe.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/fovurinuduziburuvi.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/f399593b6d9bb4866f07d018063a3ffd/37026954134.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/7e972bbac9a8063974b7c798c57554b3/gimoloxenofeneb.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/65958996451.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/69826913196.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/wolasefobotuk.pdfIn PDF document text
    • https://adikkedua.com/contents//files/nuluzomajixup.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bf1ba2d67---50665499897.pdfIn PDF document text
    • http://txextremecarts.com/userfiles/file/48652790700.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/178c8202bf523b911a9341d8ab35c469/zadogakipu.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c1ceec88f---97328859851.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/c8538a833110ddeb8eac348dcee8c42d/39514963218.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/95835961640.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878faf1de4c---8791336702.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/motabapijorivo.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082faceb3a29---71508037280.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/39996610876.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_off0000e83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83D 17500 bytes
SHA-256: ff2b15c03c949c97be29a7cbd77b41a93c613e5e48da336dee3a749e88403f2d
font_01_sfnt_off00011575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8C 10832 bytes
SHA-256: 378eb3624932e5821ac77601e756ca6f4e07d0b4b472b20cc8247c22fd5fa1e9