Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1489c50977b4cd…

MALICIOUS

PDF

68.4 KB Created: 2021-09-25 18:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6411b92b6a04cab82b9b7d6633857302 SHA-1: 6478d7e8ab0442ae562110a9096751649fd97075 SHA-256: db1489c50977b4cdfc4977595f7fe866effa0cc7ecbe2ac0b53a9c8b7338206c
196 Risk Score

Malware Insights

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

The PDF is detected as malicious by ClamAV and exhibits characteristics of a phishing lure, including being image-heavy with clickable external links. The heuristics indicate it's a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or download further stages. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 68 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://rooptex.com/uploads/37300049071.pdf In PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/19015238509.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/17516403560.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/27159577754.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/85035135158.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/fm0hqav6h7vgl8oa67pmpi0s2k/xirepemadaxados.pdfIn PDF document text
    • https://trakyasoftavukatwebsitesi.demowebsiteleri.com/upload/files/19080113160.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/3aa24ff5cfebe81b7d3c481f409cddac/guperexamebenawonaras.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/47060450533.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/54965598603.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/gomuparazufoduwusexev.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/xazevor.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/giloxizomapido.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/xuluxa.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/jemonavakonujojidadepe.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135a00fd95e4---jinonirexarisujafunum.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/98072487529.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/kupimopad.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/xomigesexovasuwatuf.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109121018554294.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/rozotasexama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=phone+data+not+working+androidPDF link annotation
    • 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_off0000aef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC706 14320 bytes
SHA-256: e36efdff48eab5e0b18a0fcfa3a51711f5ccfad15a63343e324861941450f5bf
font_02_sfnt_off0000ea9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9D 10492 bytes
SHA-256: d9319490d7e4277e6381cb28a0c223d66fdae055960edea45db3e136fe8e70d1

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