Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d95ef1526c3dae…

MALICIOUS

PDF

102.6 KB Created: 2021-09-05 01:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ec7e3e0455600a6513697c867f2224a SHA-1: fd87d3643f3337712fbae01247ada484c7edebb2 SHA-256: 89d95ef1526c3dae4aec145fb5e41fcc81e3efe6bdde6696ee728733bfeed832
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://coretry.ru/uplcv?utm_term=definition+of+statistical+terms+pdf PDF link annotation
    • https://coolinterier.sk/upload/files/19749091075.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/62712939612.pdfIn PDF document text
    • https://chp-travel.ir/data/file/43350850310.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/3471a392009b4215a0d6434671dfaf81/wowiwagajosupebupamigaba.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/voxobedalibupofuzure.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/9727603837.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/65790148853.pdfIn PDF document text
    • http://fxmeat.com/upload/file/3be06e47c6aaf9fe87a5f6203528daa6.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/f4ff038d073ae5bbd0a0c842230164d9/tuxabek.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/maedl0tvthr5254pf4fcnuavu1/vexujiwofokizudofazi.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cbcdcb9979---12522332395.pdfIn PDF document text
    • http://szcftz.com/upload/dewazesonuzikipemujatuvug.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160879d60dd0c8---70127892404.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/00d4455dc9c7d996aaa65db37a0a1b81/90089075406.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/75juo42rlm77u1hrmp2uvdk8no/baresexaziradofakinuxov.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zitodewizeferatikuzutu.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/norebojilafuf.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/c571fej5gjvp1mmh6vsc5qn1en/fixeja.pdfIn PDF document text
    • https://senhewood.com/d/files/35702642673.pdfIn PDF document text
    • https://reinigungsfee007.de/wp-content/plugins/super-forms/uploads/php/files/cs00r6c2847fj1tqo8ljuht8g3/83850384136.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/q1vv9m4d4p47k3sr9a8g7gjnt4/daboduxutujer.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/gesimude.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/wumovafutati.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/pogixogugegaw.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_off00012b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001433e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1433E 18408 bytes
SHA-256: 7df3c47c9cae403773d9fe1989ae391e2d6264071f5967e0350acdb6003ac11e
font_02_sfnt_off00017395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17395 10780 bytes
SHA-256: 125e05f2f0e2bae77acda49eb0a3fa768150ae8abbeedc3e34878f14ac15b546

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