Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8845c65142956f3…

MALICIOUS

PDF

82.7 KB Created: 2021-09-08 06:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: abb431e401af23fbbb0a97896e05595a SHA-1: 017bd886cb852929c638648488e2ce76554ad70c SHA-256: b8845c65142956f3d5d23f1e4eda83d49f3371f0a9c6de42c4109010c708384a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to URLs hosted on compromised websites or disposable domains, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://aryajob.com/user_upload/file/gulepevivu.pdf In PDF document text
    • http://apnorajasthan.net/userfiles/file/tavetevedulora.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/29366518232.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/degoxudojoda.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/27521072123.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fbe1a73bd---nufiziz.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/44434994552.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/62806911816.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b6c6921a---pelanavojomuzok.pdfIn PDF document text
    • https://lazerom.pro/media/file/jabekumadijutojudoligikaz.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/74484963733.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/mosizilosokalezimum.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/0ecfb452cf497e0621dac0aecde2a38b/mipote.pdfIn PDF document text
    • http://imbirimbir.ru/files/zegaxivaliwajusupot.pdfIn PDF document text
    • http://thecobbfr.com/clients/4/43/4363d5a08aa72aedcf7f7d4dd0675897/File/gugedevumetu.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/wovexaparisi.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/roxopozinavuvavose.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/buzejuzibavunitagaduki.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/26253918132.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/raxerezinuku.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16094553172e6c---20462982458.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1626351725.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/jrr1smdhf76cal1n2jui95nfi3/weseverekilokowanapuveli.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/80187106191.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/606a88b117e9ae82dd886b51499dbc78/12388261720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=add+image+to+pdf+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_off0000df51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF51 17756 bytes
SHA-256: 4d173209351a9de77fa16f85759d2e88a654dc0d45be7fe32e7035a35cb93f52
font_01_sfnt_off00010d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001254f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254F 10656 bytes
SHA-256: b7189a6118a01dbf03c63c7643e00edc2539cdd1e2fa021ed76939c75af24eff