Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7601378ab9cc30…

MALICIOUS

PDF

82.8 KB Created: 2021-06-29 07:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4188739e4f7c1cbd2fbf45fe02fe8692 SHA-1: ef16e305c8352d6c8ea4af09a35fcb65772f0291 SHA-256: 1d7601378ab9cc3059cda3682df10dcd0680bd09bb5d96f32fd8308a583f199d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to potentially compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a47fd99d676---56128442214.pdf In PDF document text
    • http://dolphinegypt.net/userfiles/file/lipexagamife.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//72166745208.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/je19ob9qdfu990mc26ctcvamg4/63810209256.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/sovopi.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/ad7057a75763ab530a20fe39462fcb6a/lavalejebujituripisuwefu.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/31822301261.pdfIn PDF document text
    • http://amandamaitland.com/images/file/97794698983.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/29779293960.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/bef4ec51080b290e475976daaaecb5b0/56819381915.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/53052555577.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a21f3599b25---kewakubebakekop.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/zabuwimepuseri.pdfIn PDF document text
    • https://anakmeong.com/contents//files/gukitekopapiwokisefumud.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/p3jcce00gfmrbqifs9kc3s7rep/94648721852.pdfIn PDF document text
    • https://arerp.kr/data/file///54206925969.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/dsc5ti23rg44vl682b8iqssejn/36226788818.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/bumuxanugexozefapalomo.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/lotarezofisuzo.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160beb7c331963---lesozaluwitoxemajemovogid.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/puxumazafofonenejimipater.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/e9flfqc1i9g3v2635j4b7od0r4/fijojipazowalabokijanedu.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/092cf289a02c4acacc5edfc5082d34a6/tuwiseduzunebukazedes.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/bsblam3p7v6t3n2l7r83blb940/64902662478.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/67742385595.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=explain+the+three+stages+of+productionPDF 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_off0000e131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE131 16020 bytes
SHA-256: c77bdceda625650f0cba44f6ee2ca0dbe0f7089146502c17c0de512999db430f
font_01_sfnt_off00010a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6A 11084 bytes
SHA-256: a0e229c39ae0c49d95a612a771ddbd8ae01cb908ba8cdbce8af43919ea5894df
font_02_sfnt_off00012402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1