Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5893bb1792b97a…

MALICIOUS

PDF

87.7 KB Created: 2021-09-02 15:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75546404c0f712dbc74d98deef6d39ab SHA-1: d7b1ee5c780f11123ebeffcdc456704d616092aa SHA-256: 5a5893bb1792b97a5fb94befc76c008d7132b33d8d4c0c04898b0d81476a29ec
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and numerous links, many pointing to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to malicious sites. The embedded JavaScript may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.sacict.or.th/ckfinder/userfiles/files/45012184569.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b40a307b8---wuvopozudari.pdf
    • http://meijialx.com/ckfinder/userfiles/files/vizururimixozoledagikimes.pdf
    • http://lblussana.it/images/file/xoletulikabimalevonofos.pdf
    • http://buydecor.ru/uploads/files/fisopolajajudenebis.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f89c428bf2---lejusituditapexakutol.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/782585bacbd7cd81b9ba4fe0098b506b/xawituvidolukirixuzew.pdf
    • http://rurisnet.org/images/file/zezisorabenexa.pdf
    • https://terminal.hr/userfiles/file/sufajum.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874319b7869---75137908400.pdf
    • http://ubest.ru/images/file/zitemoj.pdf
    • https://artbynela.com/uploads/file/bivefokufiv.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cd39266f0---13614929174.pdf
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210505224042988748g6l8hi.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c16270b34---87581571301.pdf
    • https://bandotrading.com/uploads/file/venus.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c91e48518---ninez.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0e451c09c---vafopokavix.pdf
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/posalaxisirud.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/vbgmp7fmefclq62hfl99kfa6kl/gofuxozinigivutejimag.pdf
    • http://hyunshin.net/userfiles/file/83185842797.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/o1b89pqjtust1guft9nht9uns4/toxinowukekizaxefojofamol.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1839d3ad86---wowemupovuzorubiduziratip.pdf
    • https://bruceleevideos.org/images/file/9757439306.pdf
    • http://webinaris.eu/ckfinder/userfiles/publics/files/bobusajeligududitaxewo.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161047f0ee17e1---bizemugonirilekapapoge.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=sewing+tools+and+equipment+and+their+functions+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f00b.bin
ab9635afa9bfc6847122e1c5af13e1c925d99a599a7981cf743cba201aa36107
pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 11476 bytes
font_01_sfnt_off00010a80.bin
167569dd14133e4ad628efcb9ef396bf3a8ba904ae97eb2058e17d22ed392832
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A80 17896 bytes
font_02_sfnt_off000138ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138CE 16792 bytes