Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e51be6680a135e4…

MALICIOUS

PDF

68.6 KB Created: 2021-09-12 07:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4ee7686b6b16873f66ce945947879b41 SHA-1: 843400191c538c672c67c77b7dee99f932a45cc0 SHA-256: 2e51be6680a135e4899b31f9bae22a85e011aaa9942757c28cfb6d010667f17c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and a link farm heuristic points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=manga+sub+indo+apk PDF link annotation
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/36228882964.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134149299156---tidupujibozamatibafoxuliv.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/357722417.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/15582580253.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/tiligebenazaxepufifij.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/febiv.pdfIn PDF document text
    • https://buyafranchise.org/files/files/95958726050.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/161398f4c9df01---86655073697.pdfIn PDF document text
    • http://watch62.ru/files/files/84961775812.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/37094127753.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/29855684709.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/wipudi.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/5327855113.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/rikumosatugelogixuv.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/visiloba.pdfIn PDF document text
    • http://cartopack.be/Images/file/18070624248.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336e2e28ad7---judojivi.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/kasiru.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/lixenekibijedoz.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/31592082051.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4dd2d0be3---21624164811.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/90102139020.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/84001616421.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/tepuvadenoj.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_off0000af78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF78 10516 bytes
SHA-256: f4020bd0a566353f59d3afaaa578b78675a25b99163b6229faf72325afad5d00
font_01_sfnt_off0000c704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC704 15772 bytes
SHA-256: 8fc43564488e3eb4dde28b825a1d1089ae95128dc131ef5f74a16afbfa13ba5d
font_02_sfnt_off0000ed41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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