Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8068102aa059c67…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 18:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ed77ae67b0765095b66bbe01d5ce6a63 SHA-1: 1be6b75c055088d5df66e80d5efa4992abf6e6a2 SHA-256: d8068102aa059c677289bb233e26e237af51189ab1b73480258049a7c38754e8
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of links, many of which point to compromised WordPress sites. The ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' strongly suggests a phishing or trojan distribution intent. The document body is heavily obfuscated and does not provide clear textual clues, but the heuristic firings and numerous URLs indicate a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3776

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 https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/krlmvn20ejpp123r8b29df0jr9/vilakosopekab.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/db91d6a92de80ce37826fca024cd152e/pemajanewo.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/43690715156.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021081315441773.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ljq6c32hj94bki9gu6k1vu8r30/90018005636.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/lexejagepexow.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/39151464967.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/9p0hdn4uepjp2avbsa8st6uoop/39746674829.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/jopuzuxuve.pdfIn PDF document text
    • http://www.vako.vn/app/webroot/uploads/files/fumijutemesuruxalok.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/kemedupufisidexofedumodo.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca981ee223---refufobenisen.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b0374fa8c---90427091901.pdfIn PDF document text
    • http://dothanhigh1970.com/clients/6/63/63ba8bdc6fdca46b25bb56d5732eafc9/File/ronulemebogarupofukoki.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a03906ef45d---nizoditiforumesosalivawi.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/modisas.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160af9862a9215---681945112.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/jabezixujidatukuja.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/sesetatoberaxufoga.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/zatoveziwemuvevorelareru.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16095a0070b2b7---91930989737.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dc1f339b8---jagifedubome.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/87494448373.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/4dd227f7894f0f8b5adb594f96bec0a1/fubelofomusiketuvuzurole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=qiagen+dna+extraction+protocol+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_off00010090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10090 18620 bytes
SHA-256: 8f074f177b517a408c345fba1f2a87cfe58c049b615c3cb64518571c749391d4
font_01_sfnt_off000131cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CB 10788 bytes
SHA-256: 943c0ddf1ccc3f049989a6dcce8b53cd6bf8d3d33bcee037c46efb37346a5feb