Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b5043030c8b503…

MALICIOUS

PDF

94.7 KB Created: 2021-08-25 07:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9bc2b1de975e2d1a7132846abd4949e6 SHA-1: 943757c7cd6545778e5a26c9f8a75c066bebbe57 SHA-256: a0b5043030c8b503272744846ec3dec827eb18cafdeaf2f904d0edef6f4d40d6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or other disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of these links and the overall detection profile indicate a phishing or exploit delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://crysiq.ru/uplcv?utm_term=atlantoaxial+joint+degrees+of+freedom
    • https://dreamscapes.ca/dream_scapes/userfiles/files/luderoremo.pdf
    • http://zubrcup.by/files/files/25478425710.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/24a393c32ab45b04fb7971998cd053f6/68672140805.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/792b521933e20382ba9e3402b846a8af/runolelokilanokodijolo.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed82ca15d3---rixinowolep.pdf
    • https://aquafilling.com/userfiles/file/vunidezizimera.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/37023f3970eec8143af7ff0ea7b76a14/mitumi.pdf
    • https://alice-immo.com/userfiles/file/24429552594.pdf
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/32806872740.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/5f7b9fca6bc0289a8e7ef6a570e59630/37354221583.pdf
    • http://tunglamgarden.com/images/fck/file/vojaxaxojarolirumetubizes.pdf
    • https://adminico.nl/userfiles/file/nazefuz.pdf
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/92747108173.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fe8a5a57c---76561105803.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf4d483416a---95781493478.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d669be6136---73680865603.pdf
    • http://machin.kr/userData/board/file/reperiguvafasulejeku.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf323f01780---28816097955.pdf
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/kivuwufu.pdf
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/82874023516.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/9ojk6ock6l5gan79flc1l1rbi7/53780039002.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16103ff70bd657---dajolopawuvewilifiwexewon.pdf
    • http://krzeptowski.pl/file/fomenukesevejeg.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f35.bin
8f85e3da2e6a2c32e01b96b18aca15857a605e459bf69137eb1c28e2e02461d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F35 16984 bytes
font_01_sfnt_off00013b97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B97 16792 bytes
font_02_sfnt_off000153ae.bin
7a2d98531834dcf76ecbbbc9431efbc15f29c309fb9b462f37add00269f5db31
pdf-font-stream PDF embedded font (sfnt) at offset 0x153AE 10912 bytes