Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c2aee5d2e75e1e6…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 07:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 478879fec8094837c635d7b20938eeaf SHA-1: a470f38a6860b05e64e04d1814fbee509a912ea4 SHA-256: 4c2aee5d2e75e1e629cb4bd5f1f2cacc41ed710fd5dfc0529be041c34f4dd7c8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns align with common techniques for luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://semangkabiji.com/contents/files/xezaf.pdf In PDF document text
    • http://dzirerealtors.com/uploads/32741236564.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/15165152914.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/temilogipuf.pdfIn PDF document text
    • https://swiz.eu/files/editor/jokadagunojojogukovu.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/salosovuvowefogosalam.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/xarokisisinidis.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/kinixabaruvevotuwojupafe.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/vukuviv.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/najakoto.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/vofawubometedozufitiwa.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/babenaxufoge.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/25442413020.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/40871408703.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/95215125155.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/rulfatds058uv4iofi921sb1t1/80606791143.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613655c5cc902---dugujefedesos.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/nubilefedumowubudiw.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132edcc28e3c---65793786922.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/48966626269.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/lixibesitavovukuz.pdfIn PDF document text
    • https://greenlakecruises.com/ckfinder/userfiles/files/47374631526.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/88059004016.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/tixediporimigazikudi.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/moxexabegofifakeraneki.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/3734260653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=gta+v+real+lifePDF 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_off0000eac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC5 17940 bytes
SHA-256: d30d9becfacec6d3a11215109aa6f08963e8b9955be932ddfdd1a0632a817839
font_01_sfnt_off0001193a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193A 9920 bytes
SHA-256: 67302f2e39be684372b9b094b5948d5dd8b37f0cbd3b18afae961808cd5b7685
font_02_sfnt_off00012f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1