Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c26cd440867cf6e…

MALICIOUS

PDF

83.2 KB Created: 2021-09-14 07:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2d2300f260aa01f3ec599692c54bd848 SHA-1: a5c4c654c9ad0315bde468b63b5a142aa6a52b75 SHA-256: 7c26cd440867cf6eb35b0d6f228a8ccf951e4eadff9e9fee4552aab39bc51f6c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, suggesting a phishing or malware distribution campaign. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file. No scripts were extracted, but the primary attack pattern involves directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=filterloop+pro+apk PDF link annotation
    • http://riggi.ru/userfiles/file/24333302905.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/birogopaxezifu.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/82054379174.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/vapegatimawobewula.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631577924JKbp.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/74622523459.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b84e784d2264ef296bdf409c2cc20b21/80155415661.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210910154303.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f811abe658---xonibewugupifiwuboxobelo.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/mejewopatowoxu.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161359c9c97747---kujalapivavoxemezijajegu.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/76997822603.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/11420602791.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/vitisidaraz.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613976db831ec---23080339936.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/malunupojivigupudufom.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/fapufezavefeduvomibel.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/55607419840.pdfIn PDF document text
    • http://asid.rw/userfiles/file/82388787050.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/vudenajalimipogupuzi.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba31a3aaf0---legeniravuravawa.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361793aab76---sujafofuditufa.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/denenoketobifazamupal.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_off0000d82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82E 10044 bytes
SHA-256: c2200dbf5381d1fbc01c4560539c62602afea00ad8c19de2f244283edc3362e0
font_01_sfnt_off0000ee8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 22020 bytes
SHA-256: ce1f01d92be7a6cd3bc4f06ad8a4ac9a64ca4f40bad716ae482d190dc3005e6c
font_02_sfnt_off00012796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1