Malicious PDF — malware analysis report

Static analysis result for SHA-256 4962c074fb9f8516…

MALICIOUS

PDF

68.3 KB Created: 2021-09-29 03:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bd0df912247a22afb028bed294e2a020 SHA-1: d4d94a9dd59a936553c64b17c5c3704021838a3d SHA-256: 4962c074fb9f851693703e3b053a168fa80d5bd89f78081f7690b4731b36610a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an embedded JavaScript stream and numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The document's structure, being image-heavy with minimal text and an action trigger, further supports its use as a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://suamanhinhlcd.net/userfiles/file/14633932307.pdf In PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/9757161907.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/43382253384.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/63439857782.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/gipor.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/davovikesotiripeta.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/fbb11a4b3b8e6be3aec410656fab19dc/dedalakalizewi.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/kebefazitup.pdfIn PDF document text
    • https://seerupit.dk/assens/file/detabazajovugewenuperusi.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/kalef.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/bupew.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/petiwivonimuvuvepabuf.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210911194750_1769774027.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161510bb104fbe---73495960128.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210927002934.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/40796400340.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ae4934329---xakorimiru.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/67919556295.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/jojewefasik.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/34512540123.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/58849048848.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/nepidazagobizuruxowepi.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/petulijamifisafator.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/27169046245.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=chapter+3+data+gathering+procedurePDF 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_off0000afcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCB 14028 bytes
SHA-256: b35eb4be6efd9465940c2bbd01532960930fca3aaf0cd1237683c3100bdacd07
font_01_sfnt_off0000d271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD271 10880 bytes
SHA-256: e6f6384f3edb1059efd4c2772eb3d97f081e25f4050c4769df95d9dfc13960e2
font_02_sfnt_off0000eb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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