Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a181493adaa21e1…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 03:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9ff5da9be38d305e3374ae510f09b3b6 SHA-1: 4ed7cb71f37a85db5bfbd6613599a68f351de0f4 SHA-256: 9a181493adaa21e10c1985be03f2cde31b619c9d67931f8ac8bf341474206fe4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with attempts to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://scavilecis.it/userfiles/file/63471900483.pdf In PDF document text
    • http://interreg-ipa-husrb.com/downloads/88930258144.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/60a6b73b3e5e99bf20e736901ccb4c23/4432509809.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/8543847032.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/82952118993.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/lojaveneladunon.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/45185916604.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/15326757695.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/94729249191.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/lapubinosafiwe.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/007k39ohs2h7h9qtvvl78s2an0/xogixamimoburu.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/zijofofenaviribotumibeb.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/61312c251dd0c.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/jasojosutejul.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ic7oa9pgu57f939663smaeevn4/mivonuzef.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/60752005806.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/5610497155.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/fewunirulejujilelesu.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109012153555010.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/32356423073.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f67f57da0---sijebegatamusovivabemesuz.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/96067953104.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/rufeperur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=nox+player+uninstallPDF 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_off0000ddcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCF 10540 bytes
SHA-256: e34b51f5eb47742455fb8c96e122648147e9f4abb54fac78c39ec1d15cef3ee2
font_01_sfnt_off0000f5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FF 17720 bytes
SHA-256: 3cb3fae10997fec0f725d1677091dba8062fba6125b9d7c691ca1b7365a0ea10
font_02_sfnt_off0001241c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1