Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c1e187d2f30541…

MALICIOUS

PDF

85.3 KB Created: 2021-09-16 12:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: af0b21510cbeef13ecb6e14edb6d1495 SHA-1: 6142abcad40d490e9b5e874cc265a9024828965d SHA-256: 42c1e187d2f30541dcdf57f42a823acd4b413d9315d15595c986147140c9563d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with spearphishing attachments used to deliver secondary payloads or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=frozen+2+full+movie+in+english+with+subtitles PDF link annotation
    • https://acrgroup.nl/userfiles/file/xonove.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93393254673.pdfIn PDF document text
    • http://asja.ua/userfiles/file/sekezikavokuzefunoz.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/d64fb26e60c021844b84fbd29f58492f/jowugibutovaropomo.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/witidelebinoju.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/takuzedaniraj.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/29555475455.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/35768742309.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614002f755e8a---47523980514.pdfIn PDF document text
    • http://weingut-suppan.at/files/4103620799.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/nibilo.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/1091999537.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/zivubimejogaxelazubu.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/jufasib.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/nawupininezam.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb602b16fd---waxavonanegi.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/xanipifuxivuwuwemozox.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/52357888601.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/24513944104.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/50086309032.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/logosikuxonakitonojuv.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/51651024858.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/78709080213.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109032225495351.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_off0000e42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42A 19176 bytes
SHA-256: b847036d8f5c064027411e65eafaf038c21e3f061eeece84ba773bea861d3add
font_01_sfnt_off000115b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B4 11048 bytes
SHA-256: 17d227e8bb6913dcda7bc35052288c77719dc2ce1886be1fc6008def814731eb
font_02_sfnt_off00012f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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