Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f512732500a44d…

MALICIOUS

PDF

70.7 KB Created: 2021-09-28 05:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f601faf15903dcb8ab629ef0c82545fe SHA-1: 4e045d718e98d23dacaa947072a67ceaec02605c SHA-256: 21f512732500a44d161a1f6f0f3d7972ddccbe5d727d5bd925b9f11e5349e6d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various domains, including those hosted on compromised WordPress sites and potentially disposable hosting. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation tactic to lure users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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 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://ketchas.ru/uplcv?utm_term=publish+android+app+on+play+store+for+free PDF link annotation
    • http://cuanhavesinh.com/userfiles/file/miremegiwivexanipifudijov.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161395c6cb16cf---12869387544.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/pulopa.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/65418111065.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/14001724010.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/af3ef8a74f0ab21a4480b7cb964ec49b/60468504512.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/65338796040.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/79581207337.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161525485debba.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/wovewepusat.pdfIn PDF document text
    • http://goref.ru/files/file/53017441257.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/kidige.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/wafezipabuwa.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/zesitapapewobejamujokof.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/gakinobolebozosilefa.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/towajusavusigibovivela.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/67576985241.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/doliwik.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/36309166212.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/sowawakotalexipuvavi.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631642515.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/bilapojiviwodigemejiwowu.pdfIn PDF document text
    • https://goodline.by/userfiles/file/60688356867.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/mulasola.pdfIn PDF document text
    • http://autodilygood.cz/files/file/20775938769.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_off0000b1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B4 10948 bytes
SHA-256: 44230d289923b6d6e97b3cf36b15db13a7d0f1782f4312490262f8e5dd36cb10
font_01_sfnt_off0000cacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACC 17216 bytes
SHA-256: aa532b3539d8aed8b4ed489b3b6bea68d760a6b390fd3e6785d65b67c1319557
font_02_sfnt_off0000f525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1