Malicious PDF — malware analysis report

Static analysis result for SHA-256 948fd055587e9515…

MALICIOUS

PDF

89.6 KB Created: 2021-07-03 02:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a084b757795f51995f98dbf375795d29 SHA-1: d639a89ee818babd1473c295907f6bbb7d596722 SHA-256: 948fd055587e9515cbec2cc3fc1a48e8cbba9a7f9e148c2c9a4ae182490da82b
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves directing users to external, potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://oniceh.ru/uplcv?utm_term=the+unit+of+electrical+resistance+is PDF link annotation
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bfe94b4168be0aa2fbc891209dd27005/lemixulopapagu.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/71838894478.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/mekurekiwamufagadifera.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16075efd610faa---rukasata.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/39654902706.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c9ced1c47---12350752314.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/nofalumovodibodovaz.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160757ea70554b---16138246045.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/51987106903.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/86314327974.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/u3p3jthgmqcdvji7mmduofstr2/80743593041.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/53910981752.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/nanaferolazawuditul.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/solepizidukaleti.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/2f900e4a6dcd87dafe73fc22d05a020f/31842027694.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f01b82b25---jagiwarosubemilixepoze.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/92301845322.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160839d3f208b3---tarubukosigobuxagorome.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/7356596513edf73a2a5ce2c69f78702b/tobogokarugeputelitok.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/a26spk2is3da4l8fbg14nvjt6n/tukaduloxajaxavalowin.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/03be4206c3c34ee861e2c88473bfc0ab/gepewebaxuwi.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_off0000f733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF733 19140 bytes
SHA-256: 8b6d56e7deaaf9e60ce990f2269c8cd331b42fe7209ebe1f47fa9457b5fedff1
font_01_sfnt_off00012989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12989 10496 bytes
SHA-256: f8033ca284d0c80a7bcfd8f040a361c755e8b512ffd467f4ef3124d18249161a
font_02_sfnt_off0001415c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1415C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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