Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec7be1756c65af5c…

MALICIOUS

PDF

88.0 KB Created: 2021-06-26 04:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59798622fe8e1dbf6647df397cbb869b SHA-1: 6dda0d9683dc06dd596ea260e774a8f88a98bc07 SHA-256: ec7be1756c65af5c0db75614ae2803402fb98ca90f0e0843d649ffdbe81841d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and other unknown hosts. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160800572a797e---leparekan.pdf
    • http://apsara.ru/userfiles/file/devadikofoz.pdf
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/zewenojamorobuxisub.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d0c1299c3---46442894236.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/6c70e164589540cc8b3b0f22e9762f44/62835308181.pdf
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/46726a3b935758a2bb89a29aade31e8e/73790518404.pdf
    • https://nadinerogger.ch/userfiles/files/84968073525.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/kepimebolumugubu.pdf
    • http://pospatrans.cz/UserFiles/File/60311630704.pdf
    • http://ascensionchina.com/userfiles/file/dilazidunuwanifog.pdf
    • http://xn--o79av69abka850ab6c.com/upload/file/202106241723457873.pdf
    • http://mesterek.net/tmp/medesulisifufujin.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/dedutufepoxar.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e996cd9a4---porewiwire.pdf
    • http://whuntex.ru/userfiles/file/34893516224.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c923d6d8c16---42466506059.pdf
    • http://buergerforum-tirol.at/file/97140738263.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607343a79cde4---jibagudefunusi.pdf
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/budad.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/184f46a91668035736739858ba50725e/bomawulejubevo.pdf
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/94548049032.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16077a1c343be6---pamewovasire.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8cf667919---kijunenaju.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092c9ef5323b---78682342646.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607746a1ec8c5---tuvabowukabebapujelogut.pdf
    • http://pho32shabu.com/uploads/files/25682837540.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ralts+level+up+moves
    • 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_off0000e9a1.bin
2744a7ccd74771cf3af7445edd79bd7eb75162b8bef8ee0037c4874c22144185
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 1996 bytes
font_01_sfnt_off0000f2d7.bin
75d9c87a01f2a2fa85db0a94f80dbdad0cc301a51e3b2a596879a2f2ddc5b60a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D7 17600 bytes
font_02_sfnt_off00012197.bin
de7cc3ef8c5776927166fa59a0e60d4f13652c416bad8ce4dd5c991607000fd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12197 10328 bytes
font_03_sfnt_off00013909.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13909 16792 bytes