Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20a5c52bfd6b214…

MALICIOUS

PDF

76.6 KB Created: 2021-08-28 21:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9026d0780c2da1df13f3af720cb6bed6 SHA-1: d8614df54b62c7fc262cc44821baec3a5629959c SHA-256: f20a5c52bfd6b2147976e9ebd2a639f325c073522c232552040d7dc37205683b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and link farms hosted on various domains, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The presence of embedded URLs and the nature of the link farms suggest the document is designed to redirect users to malicious sites for further exploitation.

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://garglob.ru/uplcv?utm_term=psalm+145+commentary PDF link annotation
    • http://attlas.center/userfiles/file/rabuxaki.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/zujovaj.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/34798365921.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/8791074706.pdfIn PDF document text
    • https://mvservice.it/file/jizularilej.pdfIn PDF document text
    • http://goref.ru/files/file/66065443043.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/64958750686.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/b38cfdfaf2f5bc8cb4d10ae3e25129d5/94978866005.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/a7cf61b2dd6468e13d14f48a2db3cd1e/ladikubivuk.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/31020470024.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/zorupunovenewut.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f71b294f0b---dazoforesifetibul.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/77589028569.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/gm1l3hri0do5c480v5k0af90s1/rinisipudenulalavaz.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/vijenujul.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/64564490014.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/zavegigotale.pdfIn PDF document text
    • http://lachina.cn/upload/file/melavivivibifulejaf.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609156347bd6c---40086861152.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/nifevetizupogekurunega.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/82181311892.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf7a437353---80878196124.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/burixonuli.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cac7c30f314---sanijesoju.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/a7d462b235bb349556c704a6e2f4efbd/9257710698.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_off0000c63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63C 10676 bytes
SHA-256: 38a2704c3f0de790832f4643ba4179e59eaddec27377266f2cbfc3c1ac4f9914
font_01_sfnt_off0000dee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE5 17728 bytes
SHA-256: a3c533c8c06a56d72096a5c4e487c5eab0758434fa4de7bd14c05ae69daa9741
font_02_sfnt_off00010be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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