Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec92a6f943349290…

MALICIOUS

PDF

84.2 KB Created: 2021-07-01 23:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd634d8a7c5868249c25e425a350885e SHA-1: e41ff4475373de220c97af359e2f2a7236d899be SHA-256: ec92a6f94334929087e5215ac6762770964729c150196dd69ac2aa4501fdc7b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://queure.ru/uplcv?utm_term=laser+tooth+extraction
    • http://bagiez.com/userfiles/file/badipowigavaruz.pdf
    • https://feng-shuiworld.com/userfiles/file/mumifonekoludegedifusu.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/7c7a36c7cb81d89da4911f390021e77d/71414817773.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16086c99e08111---7300140675.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/b7942a3f856fb1b597cd1579917347c4/90261448440.pdf
    • http://dush-kz.ru/uploads/fck/file/89105706907.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/fef1bb530284731cc4c193d0ec8d223b/suzerije.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad89078f079---nusifofa.pdf
    • https://qnzar.com/files/nuwovuxugusi.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087b5d701887---tavukamutu.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/mav7uvtm2a9m6nqo7cl6lbt9m3/fonepi.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861c252db69---lerofijojexogilekesi.pdf
    • https://prtl.pl/userfiles/file/93548116077.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f1ffa4a13---kegab.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073fd2a130df---27227775681.pdf
    • https://next-engineering.com/userfiles/files/7749596950.pdf
    • http://chi-kara.net/userfiles/file/zodipumuj.pdf
    • http://aktifbant.com/resimler/files/95434628830.pdf
    • http://sevimticaret.net/userfiles/file/sutaxuverabebezip.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5f74120ec---jajigojekugodawax.pdf
    • http://astro2sphere.com/admin/images/file/rugojef.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ajpnmn9a39u5ck4q2svf03cbh0/39845890253.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/t6mom05n419nj1efv4ok9fh435/busowojojizazakumeba.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757892bf407---88045575383.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2d381bb12---satedog.pdf
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/21999055494.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_off0000e939.bin
271342c4b0ec75bb186ea3179e959196feffda67cea49fe9b2e6288c744dc6c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE939 16612 bytes
font_01_sfnt_off0001145f.bin
249afc8ae0d12a957d9173dba7a14b1fef51020a2103bdcc0e9948248c0d9b90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1145F 10340 bytes
font_02_sfnt_off00012bb3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB3 16792 bytes

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