Malicious PDF — malware analysis report

Static analysis result for SHA-256 95687f3f5e2ddbd0…

MALICIOUS

PDF

85.3 KB Created: 2021-07-10 06:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e59e25ea53db2ac87157d4afa3f13138 SHA-1: 017471cc2d7b3524dc4f96bae38bbebb04eb6c28 SHA-256: 95687f3f5e2ddbd0fd1f0e45d6dfe0b0a9e327cee40866dfd5ae6e36cbe8feb1
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains numerous external URIs and links to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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=how+long+will+my+puppy+cry+in+the+crate
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723fdcda81e---67610627285.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608525f78f2df---18417673910.pdf
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9547393677.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4372902c6f---xibipuvonedadipopazudep.pdf
    • http://billsky.ee/files/file/15495435099.pdf
    • https://binarbaidtrading.com/public_html/userfiles/file/14990758543.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/qehlitunfm6vsbdsjhktffl0q2/tikukuvegumekatuv.pdf
    • http://pronobile.de/catalog/file/69275246353.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/25c457149419dc33bfa141f20e759178/42248900582.pdf
    • https://cpsguffanti.com/uploads/file/giweketejamofamisan.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/nomixen.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160890a18a46df---gudix.pdf
    • http://ptairsupply.com/userfiles/file/jokobizolesuto.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/92b0422c9548154753538a74b0836fed/58457565332.pdf
    • http://learningkey.org/userfiles/laxerikovum.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/f032f04e348c671bc8be47349ab35510/47159002875.pdf
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/691076853.pdf
    • http://uk-finansist.ru/userfiles/file/lulijakoloxivakan.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/179281e361feb9c227243ebcad459c13/78638719771.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075aa6c53954---kefoparewodomenelaguni.pdf
    • https://loctra.net/userfiles/file/9983675064.pdf
    • https://vicotelecom.vn/static/source/images/file/10989714464.pdf
    • http://2440027.ru/upload/file/98971807438.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/793e0713e3f0ccd5759ce79b7e626e29/29099408946.pdf
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/28ae5aec3ff1b16dfab01b142a43ce47/33544661591.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec6d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6D 16792 bytes
font_01_sfnt_off00010484.bin
09b47502cc10cf43ea656489342ab2d8371851057ad9eb5315e548e4dd6f1426
pdf-font-stream PDF embedded font (sfnt) at offset 0x10484 10944 bytes
font_02_sfnt_off00011db5.bin
463d6634a426f3d1f091f4da12a3a7ea4c6c9a96fe3c1d85366e79cea789f3c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB5 16300 bytes