Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab97510c8d08561…

MALICIOUS

PDF

91.1 KB Created: 2021-07-07 07:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 355789472d3b4bb4846c3af54281620a SHA-1: 4da1fb5381a196b96818e18b60f107df5f9f0c95 SHA-256: aab97510c8d08561c38e4c05661cc8963cfe9fbdebd13c6ec11a02472fbdd422
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. ClamAV detection and ML classification strongly indicate malicious intent. The presence of multiple link farms on potentially disposable hosting further supports a malicious purpose, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078d5be33f07---23026651308.pdf In PDF document text
    • http://studioriboldi.eu/userfiles/files/gumexibixuluxaliri.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/73831899555.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/mawoxupuxesenomel.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/tuborifixijonujil.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/mafanofevuxugevazemareb.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984077bc4dc---miwejunonalogefarin.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/76272549703.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/nulibijovudud.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/8ca0df47240f115c443ca1f441ebbdf0/semoxudibik.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f9c36fc64---22494691708.pdfIn PDF document text
    • https://123natura.com/stockages/files/28296162403.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210514131646.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/0hcv9mpsmr19r5rcidmuc9jgb6/natalosa.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b97354b23b---9366087630.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af28ead246---52212594617.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/82566003077.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/bb0d84cf5b7d69182802c5b91acb2260/34811976978.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/2cb51dc6274c6020e5646e1366b0e487/sowelopoxa.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a86e3c78f---vobimeke.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/mvldlj3gtc4jv402gkar65amra/71749537824.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/c2d38bea2e37bc9bd35727686c8f6b95/6014790325.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/megopazabikevezogo.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/pewesopozikapemunufov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pineapple+nutritional+valuePDF 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_off0001042c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042C 17016 bytes
SHA-256: c4fe624adc5e4e5fe19b4c0b3b7834055ac9b641664356ea524640d65ed090df
font_01_sfnt_off00013033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001484a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1484A 10244 bytes
SHA-256: 57a7eeea1673534217c70ef417345f7847b7a209c2b7e9171ac9a980678e091a

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