Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b889cde74f7cce…

MALICIOUS

PDF

84.3 KB Created: 2021-07-22 21:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 46435abc8917095c76c9eaebf314d70d SHA-1: d589577b65ccc50db2f56966ad0b8177840b6f28 SHA-256: b8b889cde74f7cceb02ee1ceca46f037fe099b48aebdc1080cd716ea5c6d4b78
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The primary attack pattern involves luring users through a malicious attachment to access these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sovaimm.it/userfiles/files/10493852826.pdf In PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/de2nb5n4l17llhjvttbv6jdtvd/sesujapuvapelew.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e572070cd---84689571801.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/ridexamepijokuxisalaliji.pdfIn PDF document text
    • https://bczenekar.hu/files/file/73600831548.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/7034798266.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/28186169093.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074870e168b6---vaboromawazipejex.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/67564781784.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/0qigkuv6drvkitpfi3c6nlh4im/jezunuzelosizoroxa.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/5eebed85832ab456e9ae1defd5f4c54b/detavaforutonuwifiredo.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/delenozuvakejedude.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/a179150bb701bdf7b398c1fececd04cd/dokogamaz.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/14548741242.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/nuwezasujoxoresa.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/73021821653.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/6e11013hktig4jca19im88oip3/xenaxitarizokosodega.pdfIn PDF document text
    • http://apcmagon.com/userfiles/redovowaxufodonezinazose.pdfIn PDF document text
    • https://go2germany.ru/files/file/58147792384.pdfIn PDF document text
    • http://acril.ru/ufiles/files/32807411255.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/509b5567f1bd5ed6bcb1e397d82a7ba5/tekurebedasatagifozukek.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/cba24f57224ba8c1c5fb76d94d92d33e/32140639224.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/dinagelesebulabakamoxuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=short+answer+test+directions+samplePDF 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_off0000e4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB7 17588 bytes
SHA-256: 81f012c69b8c36786924d392736455ae73bdf514bce3314657f58da18018084a
font_02_sfnt_off00012ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC4 10940 bytes
SHA-256: 23a77758768de81dd15d5f69e60c20fed3f7cd839a514d3a25327a4f9a23e45d

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