Malicious PDF — malware analysis report

Static analysis result for SHA-256 623d4de9c4e01b6f…

MALICIOUS

PDF

81.6 KB Created: 2021-07-17 22:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b7d1a8ba42893b03193ecdf6aceaa9cf SHA-1: 0195391939f21fc68efdf568afa3ac2858af8419 SHA-256: 623d4de9c4e01b6f75c3a249a4bd0422546228cb7da09f38d63678394cf436e7
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, many of which are hosted on disposable domains or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing. No scripts were extracted, but the structure and URL analysis point to a malicious link farm.

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 https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/6581g8h9e09grc6kgk52fmdado/lenanidak.pdf In PDF document text
    • https://cgeminfos.ma/upload/file/regukota.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdd9b07540---13359395249.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1c6ccedbe---lafurezozejijiwig.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/kolidebujukituk.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/91858014844.pdfIn PDF document text
    • http://debden.org/userfiles/file/42914918565.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/dazuvumotaliji.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/53540131908.pdfIn PDF document text
    • https://codecs.roimages/file/gukefaxazolenoredimu.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/25263103308.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/jegefiregaranafugukabonez.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736b80d3a9c---72604647601.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae592fbe9bb---togekisapibivobitivog.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/japuzovalol.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/37303148664.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/vivoju.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b66c73fbc8---16486628374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=i+want+to+be+famous+vinePDF 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://bit.ly/2IRbEfuIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD351 10572 bytes
SHA-256: 46eac6dee1bdf6070bb0baa3ed1a6a01a731fac543ebc8614b8b44d048b27bdb
font_01_sfnt_off0000eb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8D 16812 bytes
SHA-256: 3b07e3a900bef6c4bb5b54992c1986fec7cd36ec0d945d2abab260ddac2984b9
font_02_sfnt_off0001177c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177C 1704 bytes
SHA-256: b000ba784e06dfed05e5036781705fc03053f75fb86b6431fcd8f8bc5d31227b
font_03_sfnt_off00011f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1