Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b34ae327ce4b226…

MALICIOUS

PDF

90.9 KB Created: 2021-07-25 17:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 617240bfb1f192d32e9bb3322ef4253a SHA-1: 280a6df9ef2949d5813d877c4c1d0c62aae52596 SHA-256: 7b34ae327ce4b226ab3970f69933d5ff6fdd6dc24409efe9c0af0d41aa399185
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites hosting further PDF documents. This suggests an attempt to lure users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b21dd4edd---fobuni.pdf In PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/d7d4b4992fe9194f3039c0e6dc052d56/wetidejosonogotabelipip.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66085912645.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/durefivozowixideperakaru.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/bomuposegitexip.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/nolofubumobi.pdfIn PDF document text
    • http://119pump.net/d/files/xaledo.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/hbr564vi8ick71keud5l30ch6k/zikasurobij.pdfIn PDF document text
    • https://banghenails.com/upload/file/nigufugowape.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/96661966837.pdfIn PDF document text
    • https://digireg.cn/upload/nuzojifoxoxa.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/kuzojodimorijexi.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83c45be68d---walijazakijizosinekikened.pdfIn PDF document text
    • http://195exim.com/datas/files/59959600741.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609832fde7c4b---82522110957.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/4v0f8gj8a42be8iuejmupueee3/50272076553.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/51fe9d18f3cdbe45c8b4f02bf505a01a/daseliri.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/a2215209a3bd68c5e25d78c8574652eb/ludujusodaxuxolawaj.pdfIn PDF document text
    • http://fedoro.ru/upload/file/katuginilojukulokegorulu.pdfIn PDF document text
    • http://jinxinghotel.com/uploads/files/jalaxa.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/pudomefibitalafixure.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/dogalazil.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/39858321600.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/2065b1745ffd48f1f4068bde8e504e93/16174478907.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/zozixe.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160c9383d3e522---67184858202.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/keroragepupafewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=netgear+n300+wifi+range+extender+ex2700+firmware+updatePDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE01 16732 bytes
SHA-256: 4984a59698aafb51f2e37470cf8ab4ea42d1c5aa4f3b98a97ad087cc8041924a
font_01_sfnt_off00012983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12983 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001419a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1419A 11236 bytes
SHA-256: c2b4b1a7a61c0e1746112d1709cfa39e1088943dede895c5e2e03eadaf0bf25f