Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da13aa5930708e2…

MALICIOUS

PDF

72.1 KB Created: 2021-09-17 02:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 488e52f7fce7d24cd9633fc37a678ac5 SHA-1: a98742b6467aea06b80ee0be14636d5a91fba9e6 SHA-256: 8da13aa5930708e20db19e62f3d19256b7218068a079ff0abf58748ae8f8a750
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous links, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 8

  • 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 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 http://clinicaveterinariacittadivignola.com/userfiles/files/58497614234.pdf
    • https://almuhja.com/ckfinder/userfiles/files/datisanebisome.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/f5e18917cc2fe15ca7d285e6b3cf8ace/63297568780.pdf
    • http://phongthuydotho.vn/upload/files/degiwukemesamekowo.pdf
    • http://ibtaker.ps/userfiles/file/gatiligixakigomeg.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9ebd8eefb---tagasewukajigikixi.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331f1f7d391---12470699025.pdf
    • https://halkapsikoloji.com/userfiles/file/fixokov.pdf
    • https://ganport.pl/userfiles/file/62204613381.pdf
    • https://propactionvehiclesuk.tv/userfiles/files/kurusejivexolegeto.pdf
    • http://jmk.kr/ckfinder/userfiles/files/ponevi.pdf
    • http://otevrel.eu/ckfinder/userfiles/files/rewuzir.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abfa33af26---51743194202.pdf
    • http://tmkb.org.tr/ckfinder/userfiles/files/30238065688.pdf
    • https://bodymart.in/ckfinder/userfiles/files/59833202222.pdf
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/danuzotevezanewijafolep.pdf
    • http://jca-t.com/fck_image/file/solanitomasajesi.pdf
    • https://allianztc.ro/files/file/turuv.pdf
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/lamokijoxujalofisavuxer.pdf
    • http://elcolono.net/userfiles/files/95448897504.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b9e0ba6f47084aeff2fdd0eeb3e1945d/5576484446.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/2009jikgi6iarm3p4ag8n2v4j7/941669905.pdf
    • https://sukienmiennam.com/userupload/files/pewuvijuzekufiwavaxasu.pdf
    • https://zahrek.com/userfiles/file/fonovuzamexak.pdf
    • https://0286869143.com/editor_images/files/xonovovadekedam.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=annakili+nee+ennile+mp3+song+download
    • 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_off0000b944.bin
f06a67bb24a34d2d685c74937665c559662eeb69c8fbace30e63d6b0de0baa4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB944 15556 bytes
font_01_sfnt_off0000e13b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE13B 16792 bytes
font_02_sfnt_off0000f952.bin
025b03f318089e75d85ddcd76f68613056fad5191623cda148d53af7773604b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 10868 bytes