Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b89cf5394be14c…

MALICIOUS

PDF

82.6 KB Created: 2021-09-05 21:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b9ee7c37b85be5f892bf071f4b043fb0 SHA-1: 1b31a7c67d34767c87611e18845f0eda956076f3 SHA-256: 27b89cf5394be14c8024ff16e07890bc69cd99f149842ca7460ac33959067f46
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to malicious websites. The presence of compromised CMS upload links further indicates a malicious intent to host and distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://crewmak.ru/uplcv?utm_term=msc+organic+chemistry+fresher+interview+questions+pdf PDF link annotation
    • http://xiaohecollege.com/d/files/38347979679.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/10258608369.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/kapubuzuwavokapukitasiwo.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/nediwezoral.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/in51ot734e895vfas085u6ukj6/99738980638.pdfIn PDF document text
    • https://renault-service.com/userfiles/jepuguloz.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b6f29cea9---24691003173.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/11347662503.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/3131616814.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/4fe3210d22114b9a982e78f7db6bd5d2/77507173597.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/vv8mmc6r02pt30lvdaafgk3pdr/vufobanudewuvelalebivu.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa0297af39---relulexap.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d2261771ff---99691685674.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791707d41f2---pinijelatabafi.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/tkh0hoj1g3fhib2ddcbqqq45n1/20427719974.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/badazokonoxunatetot.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa77ff0940---lesusifis.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/63996645382.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-7/20210507102454802464.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/dudiraramozaneturadafu.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160808f28f10a2---87841183611.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/zexumaluzujeligatipenaxid.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/70860484054.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/3d8c37f96bcbdceabcd9078862ec8d83/93151640551.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/satejimatosu.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/41121650163.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_off0000de19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62B 16804 bytes
SHA-256: 07e107a3cb507431786f8d3f3f77418c808e15f584d37994df582c7ed0e35a75
font_02_sfnt_off00012125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12125 11524 bytes
SHA-256: e263cba29407da852f7fa72348b2a8428cd53959a0cb93bdd3c930bc8c6cbb80

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