Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c99b0f1020bbc6…

MALICIOUS

PDF

84.2 KB Created: 2021-08-26 02:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c274a0a5bf45f82090c8edde89158850 SHA-1: bbc2f4e41addb9f0511c8afa46e6b12f867a534f SHA-256: 50c99b0f1020bbc6847310b5a1d361912d6fc1545b0f4526300e7108a13e8bba
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous links to disposable hosting and compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The 'SE_CLICKFIX' heuristic indicates social engineering tactics to trick users into executing commands, likely to download and run further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://coretry.ru/uplcv?utm_term=how+to+use+a+laptop+as+a+second+monitor PDF link annotation
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077c145048a2---jipulonowolisuxebamapup.pdfIn PDF document text
    • http://yuha.be/_files/file/rudivizaxok.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/48858787685.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/dibojumanenokunawodos.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/robibalamumet.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/mepikuradomon.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/lamanafesogofig.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf57a1ce9f---xadizaxuxa.pdfIn PDF document text
    • http://seritour.com/rsm/files/8651573474.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/tutixe.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94edf16a9---daliwozirixakusajup.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/87543230720.pdfIn PDF document text
    • http://progetec.org/userfiles/files/51578142554.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160851207117ad---17219100839.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/057c081afd93062d01432be035a33ea7/bozedakizikamaz.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb18e2338c4---nivekutale.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b637a017551---vifedoto.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/549ead889c5c44dd717c2949ca7a5043/78637570191.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/jiripoxuxove.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098038ab402e---36344136435.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/999c417df180fe430803b82fec9d443f/sezopimawalolez.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/90920664333.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/9480415170.pdfIn PDF document text
    • http://alptw.com/images/files/80349787580.pdfIn PDF document text
    • http://surausa.com/uploads/files/27088487883.pdfIn PDF document text
    • 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_off0000e422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE422 17340 bytes
SHA-256: 01e7873a26237c5cd4d31ec41c144eaf169da0dee04a07986bd8ef0d6f437492
font_01_sfnt_off000111b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B4 10852 bytes
SHA-256: ff599be31c1b9cc8685117e80b4257c50b67fc6a356db58d0fad0e736c7ef777
font_02_sfnt_off00012ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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