Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c43f656bbd5b3a…

MALICIOUS

PDF

77.6 KB Created: 2021-08-31 12:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5e17b9d0828e4c5f46409fac216b14ee SHA-1: 0943425383a83dc808aa67113b56063042b1ab69 SHA-256: 34c43f656bbd5b3a47fc0a2bcdd5073e96b897e51d6a464648dc0c6d22e60fae
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 Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cructi.ru/uplcv?utm_term=can+you+refreeze+ground+meat PDF link annotation
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/3847695dfee5ecb87bd39faa729a184f/xulawakawin.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6fe3bf0fe---dapopudu.pdfIn PDF document text
    • http://fkhd.cz/data/img/4117658585.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/pobipapuwivuwowega.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/rugizikiwexidu.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/rawexorelagomumuneke.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/68361808167.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/57fd949dceee3226cc1b34412984bb51/tosife.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdfb3ba7c5---zujinuguwudaweruporafi.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9f661faaf---lubozodotib.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/27003849833.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9d5b1ad5---lezadipefukeguweworinitol.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/libelarabijigeremun.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160999b9488be7---tokuxovuxiduwagagi.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1e98d2b2c---19453913236.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/58584074570.pdfIn PDF document text
    • https://kurtwohndesign.ch/userfiles/files/kuwobefizumemaxijaxabuke.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160732ccbcb93e---xafurudebixuk.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a71c12a443---30662613015.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/zumadudatanigo.pdfIn PDF document text
    • https://patc.fr/imagesfile/79000653077.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/zonavavopubabofotuxafolu.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/n3h7tne7nsogumnrmq6vocoar1/pesovafuwikurorisuzaleniw.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_off0000ccef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEF 16856 bytes
SHA-256: f1334bd6ff48dab1a6f1242edf40f182903454a08d12d74f8b1a135810ee9c81
font_01_sfnt_off0000f808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001101f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101F 10696 bytes
SHA-256: 544f479dc9e68e0cf811294db3266aec6be22f3be1768bf87d153e4621383de7

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