Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d00d08bb5434829…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 22:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95a1c0506392ac62381ba86ce654fff7 SHA-1: 6cdc2dfe425ea09f380124e9249bc2ef67090c0f SHA-256: 1d00d08bb5434829964c5c814cb90a959c46789003df04502e24454b759a3e5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery, which aligns with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://laborke.ru/uplcv?utm_term=average+calorie+intake+for+a+15+year+old
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/770210e1dedf7233916648a3a3766228/75513022177.pdf
    • http://ativn.com/upload/file/99502900012.pdf
    • https://turbooto.vn/upload/files/gogozinufelosurogasudibax.pdf
    • http://visit-pune.com/userfiles/file/76609246257.pdf
    • http://ixtvs.de/_upload_bilder/_filemanager/file/potidifadisitubug.pdf
    • https://dm288.rs/slicice/file/siwewaduzawugisifoxa.pdf
    • http://nguyenquangcomputer.com/upload/ck/files/pupedojiwav.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caddf2605d9---zamalarivi.pdf
    • http://cepsagibyachtfuels.com/images/photos/8658673995.pdf
    • https://audit-advisers.com/userfiles/file/42959638626.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b9627832b---basinubowujowew.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a63d74d8d5---vokekajijamoviveparika.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16120142111a0d---26303396791.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e70465a39fb---85980937980.pdf
    • https://dildendilecevirievi.com/upload/ckfinder/files/bebitusasepo.pdf
    • https://www.funes.gob.ar/ckfinder/userfiles/files/52167539366.pdf
    • http://csc0311.com/userfiles/file/20210818061012_6gud8o.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/9634c7445e2ab9e71ff72a5fff9da847/fikopujoxuteludeti.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/9f6d2af5dd02f08aa3b2e67390082d5d/31194625535.pdf
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/4295631283.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/4baf77a94a3f11560c76e876dbc4df9c/76353693732.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125037688290---jufovugizosakopuburuzev.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e447.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE447 16792 bytes
font_01_sfnt_off0000fc59.bin
1ed138f2baacc6da35efe4ad614965214d951a2e77e761b9a5948635eb430dba
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC59 17212 bytes
font_02_sfnt_off000128af.bin
ee26d1c7dd917b877f7c850a4299035c913f005792c510838ee59dacd84c5a76
pdf-font-stream PDF embedded font (sfnt) at offset 0x128AF 10924 bytes