Malicious PDF — malware analysis report

Static analysis result for SHA-256 931e923cf3704f5c…

MALICIOUS

PDF

86.2 KB Created: 2021-08-19 06:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ba589a3c73830e14447e8595ab062c5e SHA-1: 3853fe5940f1fdb0ef326228dce5c632a23bbf61 SHA-256: 931e923cf3704f5cd17b31dcfd6b54d61152ac9822e5b9f2ba279f6e086ad075
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites or phishing pages. The presence of multiple links on disposable hosting and compromised CMS uploads indicates a deliberate effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=how+to+prep+for+pmp+exam PDF link annotation
    • http://kemenyseprosiklos.hu/upload/file/60556756096.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/922f136d061438819b399245047cc0cd/bufoledizijamijulirimasu.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/37242603871.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/enqqpkcf3rfjkjvlkm972fqub6/68417567348.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/29764591011.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/20900592110.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/45938025634.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///3309875541.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080388bb8681---zosetu.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607da39142fdf---kepuwogamazolixa.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f217f5916ce---tifibajaketeli.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/85279242975.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/57086880542.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/27511758352.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/fupolidewul.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16107326c5f925---godilinipotiwu.pdfIn PDF document text
    • http://esistore.be/userfiles/file/14523162530.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/wabixakum.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1151bdff1---42443518157.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/7758504141.pdfIn PDF document text
    • http://besteva.com/upload/files/80516029106.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/tiferutadupelipu.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/neregelewat.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/rematagerozilasegawiferib.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/37193010753.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_off0000ef35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001074c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074C 10288 bytes
SHA-256: 678d65fc55f0b8c00512ee01464a3b0fa61bb7769dd6fbedb3bbff151730b595
font_02_sfnt_off00011e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E88 17272 bytes
SHA-256: ea8a280ea715ec7af6d43a9a0fc5a804013cf5366f93d613ab58764528975ef4

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