Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ec4f839d82b3e7…

MALICIOUS

PDF

80.4 KB Created: 2021-09-21 09:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b2d7e62d8f3f8b6971fb7fc62a85d68c SHA-1: f0516cecf2bbcd068f2b7820a1999d60055ef60e SHA-256: 75ec4f839d82b3e7880dfffb84a81f9af735903a233f9a0cd829109a9f1de5ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which are hosted on compromised or disposable domains, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded content are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://medvor.ru/uplcv?utm_term=big+phone+for+seniors+apk PDF link annotation
    • http://safeabortionnepal.com/userfiles/file/12116290281.pdfIn PDF document text
    • http://wwsm-us.com/files/file/wilifarop.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/zajenibonazezuke.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae426b5de---22924055843.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/7673422973.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/d96e6e37cd07f70c57f00a0021a57555/29102340548.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210907_055715.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/95489330515.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/dinaves.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/94069905778.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/28471804521.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/vedulitipiganer.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376ec6a5738---20567174054.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/ripojoz.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/xofepasubelumuxubevujasi.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130131722b60---jofakarivobi.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/78317282119.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/53129164832.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16143aedf4d16f---kamanagew.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/takijejado.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/9265809484.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614604416c247---sexutasopep.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/24455172687.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/nuvufe.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417504632c6---24253676691.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_off0000d372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD372 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB84 18588 bytes
SHA-256: 5187140fce4bbb239ca6aa84de5515a386d6465d6dc2dd5d746d9ef8f47692fc
font_02_sfnt_off00011bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD6 10636 bytes
SHA-256: f9e9fa3f661734c3d36f709f025eb6dd4fa360ea7c82be087bce8391b92ddcaf

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