Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3a3f181c6a26fc…

MALICIOUS

PDF

65.1 KB Created: 2021-09-27 09:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 60fd70834d16e293fe625d7a3ab03993 SHA-1: d6d17da0b6557434eb51ba1ff10dd4da3fc7c917 SHA-256: aa3a3f181c6a26fcba9738cb4368f909cbc3e047b55c5acb9cbd8c122d23ebf5
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as a phishing lure due to its image-only nature and embedded clickable links. The ClamAV detection and multiple heuristics for compromised CMS uploads and link farms indicate malicious intent. While no scripts were directly extracted, the structure suggests it may lead to a second-stage download or phishing page.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3508

Heuristics 7

  • 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 65 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://alansglobalservices.com/ckfinder/userfiles/files/52849497836.pdf In PDF document text
    • https://adikmanis.com/contents/files/60667622617.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/06c7328467b728b74e270a67bef23a7b/vuxojalesufag.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/bedefetufoxidaredaguz.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/logugizozibib.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/1713175786.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/dejonipu.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/duxesadijetozos.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/91496660329.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/55768016970.pdfIn PDF document text
    • http://fteq.ru/files/file/36094327868.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/86527034743.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/tadovogumudefepusovajel.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/kulemifos.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/36204384820.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/98462754437.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5d9797e3d---28192123410.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/valirubinoxujugubabenuga.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131a4e855c42---zitidubov.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/7fkj9dmkg3bqfinum39p53j8fk/86852420267.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/xezovaremo.pdfIn PDF document text
    • http://prosquash.by/data/48302816771.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/binoladunuwi.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/51871249902.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/9887019199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=simply+prepaid+planPDF link annotation
    • 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_off0000afef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC801 14288 bytes
SHA-256: d43cc04aee9d6c2a94638113a85aa6367ed7dc6c91a10ec84e08fef392c70982
font_02_sfnt_off0000ebf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 10356 bytes
SHA-256: d26306dfadfcbdb8d5aea4737bd81284a7700f9f35d51b6d751b0647a917c7bb