Malicious PDF — malware analysis report

Static analysis result for SHA-256 122528a500046fa0…

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 20:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 26a9d2115fb3f2b1ecdcadf5a3a6c66e SHA-1: 83d24aec4f2ae62bc104a8593bc05e015011476f SHA-256: 122528a500046fa0dd7ecf78bc782597f7a66691216996d2ea3b638520632cae
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating an attempt to direct users to malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or SEO abuse. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://coretry.ru/uplcv?utm_term=ios+12+keyboard+for+android PDF link annotation
    • http://fese.in/ienupdimages/images/files/valel.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/64808438575.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/saterepejaruzijabejani.pdfIn PDF document text
    • https://anjingliar.com/contents/files/kineriledizopunezepo.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145885568d1f---wejigiminubet.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/lopawumetom.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/89883942013.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/9361559115.pdfIn PDF document text
    • http://kag.fr/userfiles/file/56325334473.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/woneripemufe.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/1c469a2cc448e1b045506177909b7bb2/3128765079.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/155gmtm0buh7ac6dm17t0p964p/mogabibodirisejeler.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1e4abc521---89451652562.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/73154192728.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/300051079.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/lawigexexelenesuzukov.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/xokoxowum.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/vexiroworef.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c1d895327---34627086836.pdfIn PDF document text
    • http://unsersohn.com/images/file/21547781857.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/wafisivovesogapapo.pdfIn PDF document text
    • https://onlinendttraining.com/files/jolodapibexofedanofusosil.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_off0000e2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE2 17888 bytes
SHA-256: 8ce53ec7e9928947c39207a3fc7dcd1de8fc1a39720fbf54a8025b3f5991a67b
font_02_sfnt_off0001298e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298E 10672 bytes
SHA-256: c24de0fbb5c0da78f24e1f2336bdb0d59a09586b35311b0a6f7fd941815089d2