Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3122c2b9b176c5…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 01:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 60a00e1a2582753f0bdb3f16051c50f9 SHA-1: 101f441deb024a360dd25deee4aaea33e2766805 SHA-256: 8a3122c2b9b176c5240a9382af08f219ece7449ac292fb886b78a5475a929053
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 https://chcial.ru/uplcv?utm_term=hanuman+chalisa+gujarati+pdf+file PDF link annotation
    • http://isystemlab.com/admin/ckfinder/userfiles/files/bojavotisimigeparaja.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142bde19d1cb---72639785605.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/sofubik.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/fabitukipimofitemigete.pdfIn PDF document text
    • http://sdds.be/userfiles/file/rugemogage.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109112107249962.pdfIn PDF document text
    • http://aven.su/userfiles/file/4993412758.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/94101527021.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/51024419534.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/nubebipomame.pdfIn PDF document text
    • https://laps.pl/userfiles/file/satelizekejuvosaporipuvu.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329933a1ec0---wuxegorewidugukarawale.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/zomalobanumura.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/10597449257.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16317536441028086041.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/wutaraxuvagijisasafijo.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/13168021849.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/4760230300.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/motifariweridebol.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/rexevuj.pdfIn PDF document text
    • https://premiersuli.hu/files/files/rutetagurupoxikoli.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/woxupuba.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613566143d2ae---41295813562.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB82D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03A 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0000d831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD831 16264 bytes
SHA-256: ef405cc4d71ad02c73bc8cd576d0305c69ff413c7571d56a4ce237421d6a6a0c
font_03_sfnt_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 11168 bytes
SHA-256: ceb735c8702301db7219902ed05a8887bdd848118cebcadc33effe4393ea2294
font_04_sfnt_off000107d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D9 21716 bytes
SHA-256: 3003c7cb5910289df939eed0c9fcb18c8b689739838d441a6421a9159df31f6c

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