Malicious PDF — malware analysis report

Static analysis result for SHA-256 904994c5b6e5d09c…

MALICIOUS

PDF

120.7 KB Created: 2021-07-04 04:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 433a4e711484034f698826cb7f15ea33 SHA-1: 2eb160caeb73e348cbfe2b197707d5b09a4f7077 SHA-256: 904994c5b6e5d09c31d8c9a6d3dea88031969916a9d144bd5fd34380ec122052
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://www.deep2001.com/images/library/File/pizamopuvidodomizixatut.pdf
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/matow.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ef5c7b6f8---15686692248.pdf
    • http://mtecommerce.it/public/news/file/gebilemu.pdf
    • http://auxerretv.com/content/public/file/36068430402.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608d57d92e4eb---89940804081.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070389e32524---simevobojujufutowigu.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/b07jpfojqhuaiedf8e460lud37/duruvigima.pdf
    • http://boursemoi.com/userfiles/file/rexorunegubodagolimelesid.pdf
    • https://abugfreemind.com/userfiles/file/zadixefew.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfac4f88bfc---tuxodubip.pdf
    • https://arhstroi.by/uploads/files/49089716597.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160751670dca5d---54191241992.pdf
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/33412153757.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afc1e92ddb1---lifes.pdf
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/48267851987.pdf
    • http://budoprojekt.eu/obrazy/file/mizedo.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a959d506736---22193838181.pdf
    • https://melz-feu.ru/upload/botoxoduvovi.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c76b1f23a3---lisugibifuwotoja.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baeb22c6e76---11807328001.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/41bb3d42bd7d76afd819bb6cf3638fc9/moxamexinaxiwow.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5adea89de5---febotijanabe.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a9058b751---vexilitex.pdf
    • http://adance0112.com/upfile/editor/file/64107842633.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=sequence+and+series+pdf+class+11
    • 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_off00015d93.bin
195772c25f0020e864b3e98c51fefb42f781b42e5bf86bb9bd3d6168c70adb73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D93 18464 bytes
font_01_sfnt_off00018ee7.bin
f2542e538ddacdd8ddaf2293b2862f20a61c3d141a21eea35cd286a90a744ac5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18EE7 10768 bytes
font_02_sfnt_off0001a78c.bin
450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A78C 16088 bytes
font_03_sfnt_off0001bcc1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCC1 16792 bytes

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