Malicious PDF — malware analysis report

Static analysis result for SHA-256 cacff4bc9c41dae3…

MALICIOUS

PDF

106.3 KB Created: 2021-07-23 02:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 81ed94d6f1cf9afe2f269e4076bc4c39 SHA-1: e3cfe280f94b7a98cf3ea394015f68bd4fc8d21d SHA-256: cacff4bc9c41dae3d74563f77a532570085aa767b60a38734bdf39c2a9eb1dd9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised WordPress sites, which in turn host other PDF files. This suggests a tactic to manipulate search engine rankings or distribute malicious content through a chain of compromised resources. The ML classifier strongly indicated maliciousness, supporting the interpretation of this file as part of a larger malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a63cf6dc3af---sezuxavegi.pdf In PDF document text
    • https://searchlink.org/userfiles//file/16445164759.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9776861fe---pozosaf.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/duwife.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/xivumefodutinibubojasofaz.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/u0ctl5t26mdva1h8g2qub8toc4/rulepisexotitiburaxapivu.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3657b17ce9---74478300746.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/lepatogarelimimepasaj.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/tbtqb5f2ht0n2rtocoslsvcf45/9995439372.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/kemowevekusuku.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/889ca56bd9625ef3c0cb2f67b9919fec/38005915972.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/e469ebb12674acaf83f3295ba28f2086/63232919985.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cc26c718a---rafodemawuvajifozodeduxis.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/au011dhv3esmr3g22q3duf14g8/xilorogitisofozuwigawu.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ni8pmav6r8e8deao83tqd414ev/gulorebetu.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/e9b163b22205253ab4b6bb33d6eb3cfe/52982203163.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c52d75b6c---fazop.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc716e6914---29536680553.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/45724088876.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/zabepuredojafe.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/34612811.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/deturolew.pdfIn PDF document text
    • http://donghotam.com/luutru/files/kigupubugetuzofegedufut.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3316228d9b---giwilikeziwu.pdfIn PDF document text
    • http://paradiseminipigs.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=baby+miniature+pigsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B6 16392 bytes
SHA-256: b7cd3e7bd76e93cc8d3d47aa555158c51cedad9b183cdd2b0bdd32cf761df915
font_01_sfnt_off00013940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13940 18692 bytes
SHA-256: 4f67c46ded3fe288a993d2c173f7941cd01ebdd2bd0db1162ebce323e444930f
font_02_sfnt_off00016998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000181af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181AF 10836 bytes
SHA-256: c50556bcf2c7594c56a63733f6b1063bd3e7643f551edb1d1a3760fac816a97b

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