Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5457f9cc7d4d9c…

MALICIOUS

PDF

94.5 KB Created: 2021-07-02 02:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3f440c4877c36ffdb5af78483d098d2 SHA-1: 8299148ad3ee670435e319429c1c3bfd0df5c596 SHA-256: 7b5457f9cc7d4d9c87d3507070f71cd0ad037e9230d363d6e8c3a320bbb4709e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and the compromised CMS upload links indicate a pattern of directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 https://catamma.ru/uplcv?utm_term=dirty+goodnight+text+for+him
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160708ff09a04b---61935376517.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898aa25e72c---97936125424.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/f2a5olc64fttrhcsrrjerhfau2/32278793117.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/02a49c098a8c4bdecfad3936b986f5b1/xesoxojamiroxik.pdf
    • https://rosewoodcity.org/nbloom/fckuploads/file/vevarojabe.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/bfccd4d1e53f61c20b0d381dbf5b2578/sipiw.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd939c364a---92198360191.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/32d10772dcde613d3477d673f891324d/19460418601.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cf636636612---25849168365.pdf
    • https://hzautomatisering.nl/userfiles/file/25246219978.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b12f9398a37---fozisisesobug.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d74b74cc48c---vavoduxaku.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/oogpuiprlghd5hj92t1c8r2gno/jazilokeraruv.pdf
    • https://organicfertilizerproduction.com/d/files/firipotedarodakimidev.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/af06d8bc274723061352b1371ef6caa2/63477589801.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/2f372d203297f1e465e4a906c7a56eac/wumawozaz.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160950c25a2245---rituguvifesiwarejibakuxow.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acc9808ee54---disiza.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/181416244c67164f621bae664584d031/44688834723.pdf
    • https://arnetbilgisayar.com/upload/ckfinder/files/bojanuruvitemexovekevoduk.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607960c2ea3f4---widex.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/233i41eofp2dj3oh04gethuepe/sotuwu.pdf
    • http://inglewoodreunion.com/clients/68690/File/62228464819.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f623.bin
aa18316921c8833f47d4014b4e49c18c62db97efeee63515b05f029c9dda6bd2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF623 17508 bytes
font_01_sfnt_off00012370.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12370 16792 bytes
font_02_sfnt_off00013b81.bin
a1b874f72c3521c03cb1d2cf36b8c32c2bba5635c8b62f4bec35d3c7619eb3af
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B81 17188 bytes
font_03_sfnt_off000152e0.bin
10cb816cc112c7d2aba79b260d6ce7f4f1c50a7bc8508eed82a0ff70f92b67fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x152E0 10644 bytes