Malicious PDF — malware analysis report

Static analysis result for SHA-256 1daaa15aff5cc15e…

MALICIOUS

PDF

76.6 KB Created: 2021-09-02 09:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5a8427d82d75bb6e0a5663903c260b90 SHA-1: bb0d592064958622c19b6daea3d797c204c9e59d SHA-256: 1daaa15aff5cc15e6f00aed1b4a95b567faf92b2f8c108c6409c9671c1f082d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting it's designed to lead users to malicious sites. The presence of multiple external URIs and link farms indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://zrdb-drogbud.pl/Upload/file/90073527958.pdf In PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160905330d7c36---forugabepozaresepa.pdfIn PDF document text
    • http://transfertrolley.cn/d/files/bufuseput.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ad898962500---dukalolamowenumevanukib.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/fomavatupumor.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/luzanaganenosimevij.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/mojugi.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/wepoberawizoparonano.pdfIn PDF document text
    • https://bursac.net/userfiles/file/vonudimugodiwogulubes.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/zejokuxuwufefademozudiwa.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160feaba9bcbb7---kemugenawafurufarepuxojun.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/0865cef099cfbae976069f0aae6513d0/bixiner.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/49945042053.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607652bf8b72d---rejivexefof.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/dacaf9fec5939467e79ea385fabc7ac5/81435551404.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/zunoserelekobowor.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/moxexu.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3ee15b87d---78445322501.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/gthll9f9ijv39ktulte0oqc3f2/1626637144.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/22103690611.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705692d0439---wobiribewoxoluboto.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/3d02b209433fe7fa70e1afa1df4f2ec7/1552808063.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/nq2ivcthprk756d0ngd18v0p33/15390852816.pdfIn PDF document text
    • http://redactron.com/userfiles/file/65861629979.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/76146390323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+many+cells+are+produced+at+the+end+of+meiosis+2PDF 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_off0000c811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC811 16092 bytes
SHA-256: 1b1d99ab3ad0eabb43bbf15e0c269eb418909e75d34d8aeaf8a0bf1669f48c47
font_01_sfnt_off0000f103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF103 11296 bytes
SHA-256: 1987ee532de40b1f166ee51dd717a8cf0ee3a8058213e9f16f0213078a12c01e
font_02_sfnt_off00010b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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