Malicious PDF — malware analysis report

Static analysis result for SHA-256 658b4ef95f94a57e…

MALICIOUS

PDF

67.2 KB Created: 2021-09-09 07:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 81a9e0e7346c4738e839b90b54fca94b SHA-1: 55ee071698643d518c88120f378f24167c8ce189 SHA-256: 658b4ef95f94a57e3f708de58e6616dc7d8d7ecd58d4a4af63e28245490486a8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF employs a common phishing lure technique, presenting itself as an image to obscure clickable links. Heuristics indicate it's a link farm hosted on compromised CMS uploads and disposable domains, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pixomot.ru/uplcv?utm_term=file+manager+hide+app PDF link annotation
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/0e4d10866471d297b2fb9b70e842624e/malarubeb.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/jaloxuforerexonajale.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/30841577594.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/tepujitonapimafo.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/bozeburukituvetalipej.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/wexop.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/wovisaza.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/598c68c26b075c7293aa62432f6460e8/giwopadikugawuponakotogox.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/98236110664.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/dokovomixuxerifago.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/686ef2d1446f22ce28baa5e752732a65/xeximenik.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/5177143788.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/38844356887.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/bozedujufojofarubenomu.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/kuwaneji.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/65271881385.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210908110739.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/32954633286.pdfIn PDF document text
    • http://15881588.com/ckupload/files/74571456478.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/50083345954.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/luvuno.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/kexetefibukabogabatog.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/14768473815.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/82020466666.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_off0000aecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAECD 10432 bytes
SHA-256: cecb8eda67381b887109674e20ba1e26c70e3ab56bc9838a37e93acb583b8190
font_01_sfnt_off0000c5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D9 13740 bytes
SHA-256: ba27ccea9c864e9649562218fb99fb3e673d260baa42da5dd5f3897e14395214
font_02_sfnt_off0000e790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE790 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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