Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcbcb8d2883a38a3…

MALICIOUS

PDF

69.4 KB Created: 2021-10-01 12:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 741630874fe9ff345751b387f17eb3dd SHA-1: 1f3235833ec5531947d31dc66406e36bc9d81df3 SHA-256: bcbcb8d2883a38a3e2abc8deab14af4345f55cdb622aadf826d0777837992142
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of a link farm and the use of 'utm_term' parameters point towards an effort to lure users into downloading potentially harmful files.

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://archism.ru/uplcv?utm_term=word+game+download+apk PDF link annotation
    • http://asiadomainstore.com/userfiles/file/duwagerokotojadividuvur.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ac8d6ed48---wegotivijitijoweb.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/sovewisetuxiremujal.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/89992624869.pdfIn PDF document text
    • http://archive-2013.humandoc.pl/attachments/file/xaxab.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff747d364f---pikuzuxulobasajatesujusoj.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/fukupuwojumizez.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/67580672361.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155ed41564ed---wiwisabawiladokajagu.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/sopitirugotape.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/dumawejuposuni.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/25946412617.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109100853569440.pdfIn PDF document text
    • https://raljob.com/userfiles/file/77422939465.pdfIn PDF document text
    • http://5e10.com/file/38423662043.pdfIn PDF document text
    • https://dienmayngalinh.com/img/files/56112299501.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/femodalotagapitoxi.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/64285862168.pdfIn PDF document text
    • https://eurotig.ro/file/jalefevojemaneni.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/52092486553.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/zenodebilerufirigaporozu.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210908_7CAF4B8B16E0192F.pdfIn PDF document text
    • http://vaithun.net/upload/files/wezikevitoroda.pdfIn PDF document text
    • http://derivat.sk/files/mopovarunesamudawinojani.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/62673572206.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_off0000b096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB096 15948 bytes
SHA-256: 84014731d7822137f14f4e7743290c039c71a4938500135dcb276245d73c2ef3
font_01_sfnt_off0000d853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD853 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06A 10548 bytes
SHA-256: bee7d59097063d20a59641b219014fcf4460522d146702fe787e6f9fcaeb5dc0