Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddad6fcba1791297…

MALICIOUS

PDF

81.8 KB Created: 2021-08-19 02:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a6e64e2c4bdd064d2cb4e15950001628 SHA-1: 1c30d9cd68672081584cba2a2fd26a1bf248185e SHA-256: ddad6fcba1791297e585154d297d7dcd1f15b677d6d3d4c366e73737b1a7f76f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host and distribute malicious files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates that the document may be instructing the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f0761e521bb---senuwegus.pdf In PDF document text
    • https://cursosadistanciayonline.com/medios//files/xitifovivep.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/13019148085.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/78170063372.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/femubutuwo.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/4ab26ad00b12adee06b7771b6e920ce7/gupotoxidinakatowanug.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/35463026333.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607f245e60978---porulodabuwerepugevizibi.pdfIn PDF document text
    • https://cncunse.com/d/files/98312365091.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/jesurunitup.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c1352d356---kikeleneru.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c404e8bd87---pozikum.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/r8bhp48f41f5vc2in8l191vcbh/jijusun.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e39070c4c91---jiwup.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba321384e65---16215716403.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aba06c8a626---buxolopigokusejujemu.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f91fb82d1---1024372638.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/m29kn6elg70db1m1ogj0h0u8ha/61327783383.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/7dfb77d69d9755c9a67ae0dcb7dbe14d/gezejanepudob.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/24020016562.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/fapixifa.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/f140b3aa327b919e0aa9eae7d695f028/88808468973.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/buzaxadefe.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/36479842997.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/35874896552.pdfIn PDF document text
    • http://mastersequipments.com/ckfinder/userfiles/files/12551397243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=summary+of+american+flag+stands+for+tolerancePDF 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_off0000dc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC68 11108 bytes
SHA-256: a81f3c556bbfa916ef9e7d24ccba68e3771aa131496ad846912661c62fe06fc2
font_01_sfnt_off0000f622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF622 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E34 16740 bytes
SHA-256: 1d8dca70ff327bca3b67844b666762b060ff8db499220ed8fc865cbb0d6ab17e

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