Malicious PDF — malware analysis report

Static analysis result for SHA-256 b296200ee3531e48…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 10:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8b51b07413d075c42d35b535f73a4ea1 SHA-1: 76f4f7a1d8b5eaa3a28013cc381f9d1a7f3ddd6d SHA-256: b296200ee3531e48e7916a75969ed4e1b8edfefa8196decc9ad563b18fd422e8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs, while some are benign, are part of a larger pattern of potentially harmful redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.prctech-th.com/ckfinder/userfiles/files/86131603959.pdf In PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/68875202324.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/wufuxopifetid.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/82755272363.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/xebosatubukivelunigaf.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/debiwunujubudesezuxu.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/97661181630.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/kobeguvanipegudevafoxu.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/61039937380.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/23712306134.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/83425815336.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/20300104231.pdfIn PDF document text
    • https://e-midas.ro/files/file/wolirojez.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/sijiwodolekoretowegumosi.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d72b92c75a---51536460661.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/vevek.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1pg09rj0ec98fhp7caqk76gsaj/61381685240.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/82539574176.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/a3ee4eca03c6af3750436ac43b30819e/59538201543.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/jarovawajafiguz.pdfIn PDF document text
    • http://www.moyekolodin.com/files/39721315786.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/dujimowofali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+set+gif+as+wallpaper+iphone+7PDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/9972410965.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CC 10764 bytes
SHA-256: ef6d01056a156227fa100d92a412c7cbb33b0438697a7df4733adafdc5f19331
font_01_sfnt_off0000ee92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE92 18008 bytes
SHA-256: 2a82fd69fb5115141d3f59900450f3ef270f6a160b4195e379fa6cdd53a730b2
font_02_sfnt_off00011d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1