Malicious PDF — malware analysis report

Static analysis result for SHA-256 73cbd0db5015642b…

MALICIOUS

PDF

67.9 KB Created: 2021-09-04 07:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0acf7844422c409eb0b9c3f29a1fe2d8 SHA-1: 4e418c0275acd8866256ff7f1fe90d094eb5c625 SHA-256: 73cbd0db5015642bff7c2abaee241f54e32ecb804817e393c1fc9b526de68ff4
154 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple domains, some of which are hosted on compromised WordPress sites or appear to be disposable. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5668

Heuristics 5

  • 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
  • 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://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71581428366.pdf In PDF document text
    • http://igigeothermal.jp/userfiles/file/84639378072.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/lupava.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/detuvowurukisewaroteb.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/fofazejopumetonakoxamaned.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f08390c28---juzofaxuwedibekewadezulo.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/pasuzenozotoxonixe.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/pemizuxapeditopid.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/34274473026.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dccc92f4226---12406992123.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/59613432936.pdfIn PDF document text
    • https://melz-feu.ru/upload/41249393941.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160863c7d73838---30390666083.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/wowologelubaxugimadifutir.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/bcd7804f1583d3b9c693c430dadcf457/89020603710.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609843ae8afdd---metevo.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/14864193762.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/t5aio070e8da1fc6jlspld56f1/43541706079.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/32944771278.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/20605021162.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/c4b7ec957820a07337bf873491bf678a/67322548695.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/10061948641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ganesh+mantra+in+bengali+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB534 18088 bytes
SHA-256: 101e40e4769a20dbd0ba26327d326a05790ad20be0340d98788a9e5bd5224952
font_01_sfnt_off0000e3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F3 11004 bytes
SHA-256: 92765ccc04733cd6ad2d9f53b935c35b6b8b5faaefa8fe08c225f243f3c7323e

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