Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa35c08561d79b2e…

MALICIOUS

PDF

84.0 KB Created: 2021-08-27 21:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 24ae05e627bc84fc616f9871f5aeb156 SHA-1: 19739469267c94103e97dd85c759e77023f08e3d SHA-256: aa35c08561d79b2ea8b100d8906548c164f2965f3cb0ad2d6ce3d3e6cbe2634b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded links are the primary indicators of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://thietbixanh.net/uploads/files/pufov.pdf In PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/40a82a26713cee452c4e3974689d4e31/64472794055.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4c12c85e1---rorujaje.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/vozijuxogefoxiv.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/de8492e656c4d8fa0f6bb0c3f397f5cc/82509021706.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/tedijowofixotot.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091578b81e19---6560069489.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/97e05d9936ba70333ad2c297c5a7daee/famaxopixexonawa.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/96713338454.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/zupuwosoganutemabaruf.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/ac61db6c3d2dd2716682ed200031c11c/3371082250.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/nobokiwepiji.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/pabizur.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/zosibilijujipozo.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/84610355163.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e34a9b744cf---kadolefodaj.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/242015311756.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/jemovonilogejaxuronomewub.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/lutenixaku.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/linojariwel.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee65f4ec182---rituwojugavibedo.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5dcb82ea5---muvanadaviregu.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/83347088229.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/b1389997cb5137fe6ee2e7a8415054f5/18773772709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=common+words+beginning+with+uPDF 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_off0000e159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE159 10844 bytes
SHA-256: 3977aa7393051f59f7b34f8955a1899d520cf3ceb794757e187a24268bf06afb
font_01_sfnt_off0000fa09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA09 18244 bytes
SHA-256: 4ca31d661446f7aa297bfb60e3b58ec2d3c1bade9d3fdc25486a3cf7ffa575cc
font_02_sfnt_off00012900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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