Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc1181487c68db0…

MALICIOUS

PDF

78.2 KB Created: 2021-09-17 13:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 742fdeec59d61fb2285f631eb703fdf7 SHA-1: 6b3659709b7a5f3780f0808e1da1097e728056b0 SHA-256: ffc1181487c68db0d8aa113c5b8b30a13304dbe06f8dc2d75afde1373b0c9186
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL distribution are characteristic of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=live+cricket+tv+apk PDF link annotation
    • https://czus-lukasa.sk/userfiles/file/71744573042.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613216dab166e---36011885523.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/51657254235.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/22861263666.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/161424efd3b277---10688243858.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/28013046729.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/68eab620fbb64eb4872219e6a7149e6d/62957802239.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/3538609360.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/4209656189.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/26714210826.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109110230579225.pdfIn PDF document text
    • http://hodori247.com/uploads/files/28230073313.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/ponuronegedo.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/tafikivurixa.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/dafupubejazovesuwova.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/26061520384.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11396653278.pdfIn PDF document text
    • http://scantech3d.com/files/rivolex.pdfIn PDF document text
    • http://videocycling.info/files/file/gijozon.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/zufutiw.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/siluwo.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_off0000cf60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE772 17964 bytes
SHA-256: 72005920973c450d0c63eedce0e941cbe72e85e45bb4bec83c38f15f420cea2e
font_02_sfnt_off00011580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11580 10044 bytes
SHA-256: cd945f4318a93b638fbab913e8da3878175450e9f15febbdfe300492a7b09c6f