Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91d3547a04b05f8…

MALICIOUS

PDF

75.6 KB Created: 2021-09-28 17:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ed275e85fbefb118795212886e3c88e8 SHA-1: 37e7e8e1302fb9d97bbf08d699fa022f4b31e5dc SHA-256: c91d3547a04b05f898ed742ade9aecd86430533118740d111dd8a9468aa1aa17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The presence of 'utm_term' parameters suggests a potential phishing or SEO manipulation tactic to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=the+twilight+saga+123movies PDF link annotation
    • http://hamkr.com/userData/board/file/lidusitovokibirulaxug.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/fagegibubelod.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/kupumabatasal.pdfIn PDF document text
    • https://cmoretv.com/userfiles/753441151.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ahl51bl4tprnk2hv2bmcpushur/59425836495.pdfIn PDF document text
    • http://ecocj.com/userfiles/file/20210924234858.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614831e8028c6---begawakasa.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e35bba299---24771253895.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/miwigafija.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/70795717270.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/bibimixomaserajase.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/pafedipopoziw.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/16898918867.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/lufexaxojexefow.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/naxozonewakujuluxexok.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e902c408a0---39453973104.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/zogasasolenamixedidu.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/rokav.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/26849242276.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16152e61458706---5962748787.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/lubebolubiwuvuvokuvabopaj.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/53122322864.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/41226203834.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/49200135514.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_off0000be57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE57 10812 bytes
SHA-256: 2c1441afaeec374abaa134df7ebf4be27e164f832474b48c496a31bfcd7faae9
font_01_sfnt_off0000d77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8F 18872 bytes
SHA-256: 5642fd8fd4f99bc37c3c2b1e663df294fcd39aa75a22ecd875938a2fa689eeb8

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