Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6227e3708956789…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 19:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c7781a91a7d768624b9d0f2a6235d3a4 SHA-1: 2c9951522fca0c3ef344d2a8f4bde27479d43489 SHA-256: a6227e37089567890a5db60581ade9686dc3b629cdd7682c6f0f89467e49ffcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on potentially compromised or disposable domains, suggesting a link farm or redirection scheme. The presence of external URI heuristics and link farm indicators points towards an attempt to direct the user to malicious content.

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://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/muponizukilozenikixul.pdf In PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/bufakujejajanerujolatib.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/togigig.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/vajewukidu.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/52496539302.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/lezegodimuromizafudonaz.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021982349151759.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/sidelepobi.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/mevomejuvufevewijerab.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/19777248124.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/buraf.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/82695098958.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/e3420a60f8aa40f871eae5266812f670/22494279093.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc4058277c.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/gixuwamugep.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/sanogudada.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613407148d543---sogotevunavumanafe.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/60133540935.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109042023166184.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/95378215857.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2d55b403f---nijekikarudubogokizakem.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4cf8cd6c27b8e988a90cc79300101e7b/xenutanakaf.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/bojajenefiga.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/pojelodaduperimovokomoviv.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/61592685a0f7b90a45d1b691bb9591d7/lugotijekamakasesewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=metro+last+light+cheats+ps4PDF link annotation
    • 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_off0000d6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECE 10620 bytes
SHA-256: 8729ba78de909f37dae638bb5d8f00fb744364e7da7251dbf89afa8b53d6a574
font_02_sfnt_off0001074b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074B 18752 bytes
SHA-256: 44764279688107414e14664388da14ba9d4f460ad4dcfb9136c049158aaf0374

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