Malicious PDF — malware analysis report

Static analysis result for SHA-256 397d21493c65500f…

MALICIOUS

PDF

79.1 KB Created: 2021-09-15 14:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 68b7cb8296c46e937fe1931969443195 SHA-1: b60b40f423428afbbace000d7ad91318e59b25cb SHA-256: 397d21493c65500f882568a3fadc7c0eb8f9b0ef1d586e8210514e90a0b94a3a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Data

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious phishing content. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to host phishing lures. The 'SE_MFA_LURE' heuristic indicates the document is designed to trick users into approving MFA requests or entering one-time codes, a common tactic for credential harvesting and session token theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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 http://sun-tes.ru/files/file/gojajirinam.pdf In PDF document text
    • http://modernplating.com/userfiles/file/39432939727.pdfIn PDF document text
    • http://word.mn/uploads/assets/44019329947.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161416f39cc299---jazevulelaxobowuwumef.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/38103268603.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/zatakit.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e2e5d8e63---71682660882.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/20071395402.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/52196158224.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/darajujipejivupenukegojo.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/warijodu.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/58177899366.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/30983037951.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/jesemisutumeli.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d23b6d998---samusiwuxokibonixidiw.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/11845646838.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/luwesuwakud.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/8a25006e889b701f68e70b538dc5ec1c/vosugivuwos.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/jimonawowufagozawu.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/janew.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/37119714600.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d1728c598---65317620778.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/33561875830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=roblox+gift+card+numbers+2020PDF 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_off0000cba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA7 17716 bytes
SHA-256: 8c3a2d1ab1ef28a7b24ec8665f75933b84fdaddd1878da9da349629002ed1907
font_01_sfnt_off0000f9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FC 11448 bytes
SHA-256: 6e959ed9a1e7def86c0b7ac2d289e8f3d4b46150e70a8ecc3e27e47855510e7e

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