Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c302c6453a64d62…

MALICIOUS

PDF

102.3 KB Created: 2021-08-16 04:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e7c47c74095725175e9f2c7680c98eb1 SHA-1: 935ac927616bd57684462e3169568884fb45aa0a SHA-256: 9c302c6453a64d626402157796b6478282a1cee0a11c6b03bfcea87bd320929b
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of these links indicates an attempt to direct users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • 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://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/bc293f134b63dfcf6a030e0c627d1ad2/tagotatotudikab.pdf In PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/de4a45e59c45c02d6fe52e2537621bee/62053349145.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/lhg9a6tkt5jjke8am9iphmvv07/35585473069.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/28923308652.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/68469507133.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607217145b701---woluz.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1d2a65ac3---tupupijiguvolugozesade.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/n0qne1n8g77sahsi22pkhrs33s/gexejinowaluxin.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160776dea1c80b---zarepotajutavozuritase.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/eaa4d467e017baee0b73be12da6689c6/5443358094.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/novumideruzasatexenugono.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/sgn12865u03lnne0oid097elsc/46821081409.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/40170825450.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/9715a820891d52573425fb7a3f780a2b/56599512221.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/dewukus.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c03114b438c---tixaxale.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/fikowerofikenigam.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/wotoliponememutok.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/zuvibulexubujuz.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/mazokatujarebexo.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/pegejipipofupaxojugakotuw.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160794a98de981---51966410209.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc91c8443---80912659231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=corporate+business+card+design+psdPDF 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_off00012561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12561 10912 bytes
SHA-256: 15df18d2f833471f58c050df1d97956a02abdbb4f32699a0af802ae94e1f575b
font_01_sfnt_off00013e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E57 19716 bytes
SHA-256: ccbd36339a032514f96e8a4899040b5ff9cd902af497f276af9c1bbf22a1261c
font_02_sfnt_off00017095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1