Malicious PDF — malware analysis report

Static analysis result for SHA-256 486b870cf729363d…

MALICIOUS

PDF

83.8 KB Created: 2021-08-25 17:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: de2ade7fd51ca83ec90e795f25dafe2d SHA-1: 6b44f31c4ad2e406ea9e13918e2fa181a25b1d31 SHA-256: 486b870cf729363d29ae4be5a1986c8efceae22c9e97098096fcda4261e1eefb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=similes+of+wise PDF link annotation
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zezijigimisok.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082f2c8ce8ad---wesulodivuzevolivatinel.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/fazatiroxelewowij.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/wepijatafeb.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072cbf576120---36892120667.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/ruragome.pdfIn PDF document text
    • http://yuli-china.ru/d/files/gakixora.pdfIn PDF document text
    • http://rotang.net/userfiles/file/monejaneziwofijusuzo.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/rexopagotulubijozufoj.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3fa986636---jopiruxa.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/68224656369.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092864be7da5---zujojod.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/28495458668.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/5uen9ec4blc0v0a46dq4c10r9k/ditadoxuparirorakepaji.pdfIn PDF document text
    • https://patc.fr/imagesfile/74482509353.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/bezewiga.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c058acc7994---38517323876.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/10088a47d7996d69a0579ba8c8e49ca8/kegorezafoxutolor.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/70n1vgpth01h0d8gmna9a68lct/5115883837.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb9055eca2---70654165709.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/15693236716.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_off0000e692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE692 17200 bytes
SHA-256: 9bc5c8cc86f7af25595e3ea7a41727110d846f57b8def18b0831b3e5f7f4f1a5
font_01_sfnt_off0001137b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137B 10072 bytes
SHA-256: d6a21a97e64fd427f049616dcbf17b9f3cd93a0018eaedd1c6ae85462ecbe18d
font_02_sfnt_off000129ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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