Malicious PDF — malware analysis report

Static analysis result for SHA-256 22fc146ae01da24a…

MALICIOUS

PDF

75.5 KB Created: 2021-09-11 07:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cdcdc9ad5f28571c6182fd85242a747b SHA-1: e7b8003be9673373d2ee92efaafcee5f97bd07ee SHA-256: 22fc146ae01da24a758c094acc3dd414f5e2e07463cebf8dcf3d3ace6b55376f
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://irlanc.ru/uplcv?utm_term=clash+of+clans+mobil+bot PDF link annotation
    • http://wine-paraphernalia.com/files/winep/_repo/file/vejelu.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/saxuvedopoda.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132d4985d7eb---76800657552.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/79299644675.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/34243267261.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-9/20210909025136237308.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/zofaro.pdfIn PDF document text
    • http://tencanpowder.com/d/files/tadagekorunawew.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/75369411597.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/67265224923.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109060358053110.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313c3aea0ab---99690018855.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ccd1c14a8---sivunataruwin.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210905163555_km99bs.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/93782894908.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/47947239749.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/99354965324.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210906025829.pdfIn PDF document text
    • http://pasaru.com/upload/files/wimofepos.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/34627283459.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/6363687887.pdfIn PDF document text
    • https://soechi.net/userfiles/file/15645375679.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/307b0d1a3182d7e173e771049c0d2b59/xovisuduberugube.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_off0000c143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC143 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95A 10540 bytes
SHA-256: 593c3ad0d7f9422c8a76cf3599c3b9a6f4f5c577a93e04d812476946255cbe61
font_02_sfnt_off0000f129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF129 18172 bytes
SHA-256: 2de064fb1866b76f55c0140c82492d81b75e4788dc9c5414ce28738bc74ee7cf