Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec2558ccc80adb9…

MALICIOUS

PDF

84.1 KB Created: 2021-09-15 22:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0ed1b104922fda144a5150892d17a5a2 SHA-1: 1576faf98313162d13734ce72a0ec3a9a319074f SHA-256: 6ec2558ccc80adb92e7266b883e12e1963a5ac50efd90a13a071e3752ff1786b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://catamma.ru/uplcv?utm_term=the+house+of+violent+desire+full+movie PDF link annotation
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130e92f25826---tirejiwuzofagonese.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/jurogikopome.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/63238808859.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/99940817412.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/dejatijewijaxuxotanogame.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210912170724.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/7282531438.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/6580cdb020f530acf5674e5f4e72f8ec/23173930134.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/gumanozibitan.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210907223516.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210911_2d9e1.pdfIn PDF document text
    • https://castel.ro/userfiles/file/pugaje.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/8917135370.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/pijinamuvufimisubusakezef.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/79738754603.pdfIn PDF document text
    • http://yilip.net/userData/board/file/39373104775.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/vavekuvuxivomadubemakebi.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/61799410186.pdfIn PDF document text
    • https://beaszemin.com/files/61138421392.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ed7950a052f4b0a2bd7dc5355d212d1/23015481476.pdfIn PDF document text
    • http://caythuocnam.org/images/files/25848934850.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/20045690251.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/dunuvakodigovazaxudiger.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_off0000e559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE559 17428 bytes
SHA-256: b6b07810f85e945f2376ad91876c8e237336571f9938b08f30513e94e498562b
font_01_sfnt_off0001127d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127D 10584 bytes
SHA-256: 11dbc732729bd51354416e1277922e94a653a9ebed66515605ca42412ee5aefc
font_02_sfnt_off00012a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1