Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a42ce26e535cec…

MALICIOUS

PDF

92.9 KB Created: 2021-09-01 07:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d85099db99ff156279ed98c4f3134a76 SHA-1: eee2dce69e0cb5469d8d7ffca258f9214c4f2c81 SHA-256: a4a42ce26e535cec768167af688679fb9f598c1fd3a4ec6d96f0fe4c80841fbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://aymsoft.us/aym_image/files/puxip.pdf In PDF document text
    • http://maksimetall.ru/files/desidaponumularibivalixo.pdfIn PDF document text
    • http://newtop-eg.com/userfiles/file/fafabifawuk.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/74102502870.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/miwarakotavutajokubipek.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/35305016399.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/c8ea4102782fa343da9d00a65ab523d7/70323163339.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/xonegupezok.pdfIn PDF document text
    • http://erdbau-rauch.at/dedejebaviwa.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a9290572842---47183024761.pdfIn PDF document text
    • http://cosyromania.com/media/file/pelopesegerowujufijopo.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084848d656ce---dejotedimal.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/xiwinixuser.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/32ng5olp17omf3fj8lfvdcvsd6/wugalesexetan.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/81414165966.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/9i33g15u5k325gi9adgfrgotmo/rumobarikodivenud.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120087417d7c---14770842190.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/kubikedom.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/65b2eadc2bf6197da73aaa685f5fafc1/3176510472.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/34c0a31711fce5381a3a594abcc009a7/63173411979.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74b71c7a3---badogamalirobatage.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/gisivoxafew.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2241c3121---90036496451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=no+internet+game+for+phonePDF 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_off000107df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DF 17792 bytes
SHA-256: 7faa7e974bedfc6fc88304f3a527f69efe4b51b88c3d5f8281d1fbb7753abd1c
font_01_sfnt_off00013653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13653 10568 bytes
SHA-256: bc7343352612d39f997efdf39c9cf4121078d00f6e2d5a048a3d3fce9b00a3d9
font_02_sfnt_off00014e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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