Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0a8698422af3aa…

MALICIOUS

PDF

89.4 KB Created: 2021-09-19 20:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 156727db1f08b014f45a7ebdf663f193 SHA-1: aedeea75b7528b8bc0ce5d36ccab857017049fa8 SHA-256: cd0a8698422af3aa4dc42a85385f3cff1acece97da43ba68d3819fc54c6ae084
156 Risk Score

Malware Insights

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

The PDF contains a significant number of links, many hosted on compromised or disposable domains, forming a link farm. This structure is commonly used to obscure the final destination and evade detection, likely leading to phishing pages or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://arucax.am/user_images/file/68951626131.pdf In PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/fepizelomirireloputoku.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/texojotikeket.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/pitinevalasubupidubeve.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/jodun.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139deac4dfff---dodubisofenitid.pdfIn PDF document text
    • https://termofriz.rs/files/48277619824.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161446692e6e6c---92840284655.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/496f0ead21b11d12053964425c686a0e/nepobixox.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/ba7383d6e30c609250f5ab4ca62890ef/92759214654.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///lufavuz.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/cfe0be26434bcac8f4576846711a6fea/wunetobewesikezuw.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/6692297982.pdfIn PDF document text
    • http://mcutech.net/files/30330705749.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/fomilupunaxuwejekakani.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394229f0342---vedorosowilumisod.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/78724923775.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/28555924963.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/bewiradigalesakirukodigi.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/91727856238.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/xovovuboxiveken.pdfIn PDF document text
    • http://rafaelokazakov.com/file/mimowog.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16136e947492b3---jobigofavorilujuw.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/b856a3f49cd813cd89e5c30ff4ef6f15/suwijonedunujabubotika.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/mudalizavof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=top+websites+to+watch+movies+online+freePDF 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_off0000f8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CC 17820 bytes
SHA-256: 6e26ec341a3ef6c308f958352bf61c91068c8c69db3db047ba0a28d23b3f9194
font_02_sfnt_off00013ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC1 11000 bytes
SHA-256: 783f7257a39d41ea02d354e2eabdd5f0727a60debe83aa76cf77cc2c0a07befb