Malicious PDF — malware analysis report

Static analysis result for SHA-256 2987ca22d0de70e2…

MALICIOUS

PDF

110.9 KB Created: 2021-08-16 22:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 53779345deb688a21e50024344c3c900 SHA-1: 5e91a253383d2b1cd4c243366ab38b8c54fea8e2 SHA-256: 2987ca22d0de70e2e44b51b3fc7e36fd18285ab6505ab0acf613cee7858de922
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://coretry.ru/uplcv?utm_term=que+es+acto+de+habla+perlocutivo PDF link annotation
    • http://cheers-gifts.com/userfiles/1009183857.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878eb6b6f0b---68479063941.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a44095430ea---91111424619.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/38224177418.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a228d69bd94---85455431437.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/fovuvosekano.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/80808398193.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160afb73db2aa3---89946834286.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/35902007833.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/f18b0e2df58c87591c904eac108794f5/78858372014.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860fe40be1e---1492673797.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/76238497821.pdfIn PDF document text
    • http://hanbangrd.com/userfiles/file/20210811163745_40098406.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a044bd0b5---kovubexukove.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/85768358264.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/wejiwoda.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/nibibaki.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/13511329193.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/83278119155.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/rasinamaj.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/75313269549.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/metijasemumitusigafus.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_off00014b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B11 10872 bytes
SHA-256: 831013dc8ff68291f702e7364435838405b34c8d4711b124ab351be898881990
font_01_sfnt_off0001643e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1643E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C50 18516 bytes
SHA-256: 63e39356a849fd85199c80882729b51834b8bcbd08edfe1cad1d5187a7628dc7