Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6d6b7aea4912ac…

MALICIOUS

PDF

93.7 KB Created: 2021-06-29 00:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab446d02bbf7a57d9b5de4273d971c4e SHA-1: 00c498b66577843fe0db751038333b12eb849f44 SHA-256: 8d6d6b7aea4912ac8d488baa8acc534f99c51c5ec5ad979fc26b45531403d585
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://inwebjor.ru/uplcv?utm_term=depletion+meaning+in+english
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a191aaf0b1f---84770697791.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c73fa31f0c5---lavisotufanejujelapufu.pdf
    • http://altelaw.com/uploads/image/file/93815656038.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f62a67564---22762129611.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4334c6a02---15382322605.pdf
    • http://xboxheerlen.nl/userfiles/file/72265706812.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/c787c133853623d3fb2c2b1ac2c1fe15/10304546158.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/91lcn9g986jvfd6qhs0af2e5ql/32589853377.pdf
    • http://phongkhamducphuc.net/images/files/14228235653.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/e71067d273e70d563a2f7921662163a1/demizu.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/d01ba3dbbd508a27ff588f57a75610e6/lojipilabaritutim.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/qmr2mucdod3bboumi2u3rti0l5/vovizebeg.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4a6c9ecb7---97708757138.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/1fe3ca29e808ccbc16c54bbb51bebcf8/52694734264.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c450646a4f0---fogobuvobawu.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8b6fed527---moginelugej.pdf
    • http://agendatourvietnam.com/hinhanh/file/94557898592.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd75c98ff---pinapozazoja.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160812b8f92907---pelatoliled.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc54d42dd2---95814734798.pdf
    • http://shannonlakeestates.org/fck_images/file/1980899391.pdf
    • https://gastrotest.co/ckfinder/userfiles/files/31585676595.pdf
    • https://taperagi.com/contents//files/9624402110.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/143c509d69384df38b53ea11d947f837/laluvajesevubixuk.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE3 16792 bytes
font_01_sfnt_off000106fa.bin
ef8dcd318b17178cbce6d760d356478e1dbf9cb628924f01fcde5d739d7b6391		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106FA 10600 bytes
font_02_sfnt_off00011ef3.bin
ccdfb21025373135e0a53d80ec2a3d349b04a29c3be544cd42c9eecf964db768		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF3 18592 bytes
font_03_sfnt_off00014f18.bin
9a4a311acee49bb2a28a77376863b4ca641bad41ffbd8cb4ce4e69f27905b4c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F18 16864 bytes

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