Malicious PDF — malware analysis report

Static analysis result for SHA-256 8557abce6a86964d…

MALICIOUS

PDF

77.2 KB Created: 2021-09-10 19:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bb3dc9fd663d938cd8278d9c3ff9dbf9 SHA-1: 5f8a1e10878f98038e79a194b839e4e394e7e2ef SHA-256: 8557abce6a86964d7315a65dc4473ee4b00fd2819e04abfaf137e0574a4f37e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The presence of embedded URLs and the overall structure suggest this PDF is intended to lure users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=v+fly+apk PDF link annotation
    • http://adria-ex.com/images/blog/file/9582579097.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/nuzewakikokatubudufotubi.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/xusizabagivevilesirexoka.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210909/16311254249871.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/82478709245.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161344cf850f56---1518308964.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/92629203721.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/49803339434.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210901183341.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/3792610300.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/wotelisabinemifezodup.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/wagejogidobavugawezimorow.pdfIn PDF document text
    • http://princeverma.in/uploads/files/zitixilunujepederi.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/xelebakajonesuz.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d31bac62c---37835332809.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/nibugexadomitobuloropon.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/melepiji.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613383738abba---benagomovur.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/p4vvmmso3uof4ssj7mkmv0nb17/tekala.pdfIn PDF document text
    • http://venkateshservices.com/uploads/domowijefagegimitudoporu.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/90531235153.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/sojanowofakafobofusuju.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/3019084186.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/wanodurifavubaxefatofek.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/8c7a6d17857b34a5fc34f5a053d001bd/dakabefenabojeluta.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_off0000c6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBA 19648 bytes
SHA-256: bd6a3267e482a2a4f6a5e4f4e2fe84db8c1c12d6a7e2902b68c1c37eb70d44f7
font_02_sfnt_off000111be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BE 9712 bytes
SHA-256: cd333247c230d6e07d01513326ab5eadc777801092e84715b952f4431eb3540f

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