Malicious PDF — malware analysis report

Static analysis result for SHA-256 44fb6d044eeb7f45…

MALICIOUS

PDF

79.2 KB Created: 2021-09-07 19:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf2b4c05c1f2c443f666b3a5c16cb670 SHA-1: 3249f6874aefa98f97dba48ba7eb4869b5e3f275 SHA-256: 44fb6d044eeb7f455f0a6ade299aa3bee009923e5730931f4fb318410ce7cd89
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using link farms for SEO poisoning or to host malicious content. The embedded JavaScript likely facilitates the redirection to these malicious URLs, potentially for phishing or to download further payloads. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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 https://drafthe.ru/uplcv?utm_term=convert+rtf+to+pdf+java
    • http://dlzhrjd.com/images/uploadfile/files/jasafadit.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b6ded2c9cf42045c81d4a726861e5edb/kixozujudaju.pdf
    • http://mid-europe-ex.com/images/blog//file/rovoxibubupirixelele.pdf
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/70523924714.pdf
    • http://vietsonplastic.com/uploads/userfiles/file/vawewojiradek.pdf
    • http://hysansam.com/fckeditor/userfiles/image/zupaseli.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6c3003704---lijanovapovupe.pdf
    • http://lab4050.com/upload/editor/file/38339762124.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ac9383bb8---kekovufudutodovug.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607675cc26d44---wexudub.pdf
    • https://happycolaborativo.com/uploads/files/wofafovejexulevuvodube.pdf
    • http://zkojicin.cz/userfiles/file/gunapereg.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a9f97b874---dezebedafumabuvore.pdf
    • http://jmk.kr/ckfinder/userfiles/files/gibamobaxumekuwinex.pdf
    • https://evergreencans.com/userfiles/file/88965415654.pdf
    • http://speckletrack.com/update/editor/file/zobexaxeriwudemelere.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/453f461560b920739b5620098b64de81/23876412709.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/2e3b44268deff245ad0425b94c181bbb/13926826074.pdf
    • https://vishalahospitality.com/ckfinder/userfiles/files/kuduxizinewofiro.pdf
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/kirugone.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/d22fa690a6a992a1da95be5dd264354e/jozuvifofuwiral.pdf
    • 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_off0000c4c1.bin
f035e7c3a8e403d55de70bc1cd9345035f4b95b97b03b4f4b63e71791c9269f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C1 17188 bytes
font_01_sfnt_off0000f123.bin
1a6cca79b9984da015bdd62db4cd32d6e1c6900ed480edb4a9b9076ccb764ec9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 14940 bytes
font_02_sfnt_off00011728.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11728 16792 bytes