Malicious PDF — malware analysis report

Static analysis result for SHA-256 52412c6dc66c21f8…

MALICIOUS

PDF

115.1 KB Created: 2021-06-29 04:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 340985e0199be4c952c0ef7b44777f3e SHA-1: 10ccc799edb04148e03251e0299c3014ecce9a3d SHA-256: 52412c6dc66c21f8ebb7782ba36487a6a1944ce7aa43cd27e1e9dfa4f26f59fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. Although no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3634

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/1858c3a0ff193ba2faf8dccbea6871e3/44927921923.pdf In PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/8ec6c50f715ea00b605684d1f2d4fc46/xizog.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e250862c9---66867954308.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/sawawoxojebujelejew.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/vofewak.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/gjl0e4u31jj1ae6rk02bovu8g3/nutigevodixemedogire.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608299b55cbc9---25448609677.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f132cc37d5---3495241766.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/7ea77eaf9238d4b3d923cf05ec4049b2/lagatubovozokexab.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160715bf148595---79777978277.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/3909631942.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ada3c44fb---xajetuguj.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/39298992334.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/772c89931568677224acebf2da417d97/senojomuduwupazen.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2d11d2ca3---78501072308.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3790c2a7d6---zejas.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607871cba3982---791305081.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607f719a2a0a3---wuget.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/95512120291.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/r84qsaqcjiqk4g97a26baq1v21/99322653837.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/d1180d1b3c167cbb77e0122ff9cc5a8f/fefidilarafeketej.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/d8f9d728ec05c8306f34c28c26ad6195/34112311241.pdfIn PDF document text
    • http://gabortech.comadmin/file/21575193997.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/15563ace961e8542bb6724c753b50113/74062397040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=ssa+1372+form+downloadPDF link annotation
    • 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_off00016e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18676 17264 bytes
SHA-256: d7d79d528bc2b1e26a6771dc63e4ed4e4dc5ae4f085dbd551fd905aab7c265bf
font_02_sfnt_off0001b348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B348 10748 bytes
SHA-256: 6989958aaa2e23a3665fe91e245e06cdb143f9d628847b9f20cf0ba71c74b5f4

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