Malicious PDF — malware analysis report

Static analysis result for SHA-256 f284c1bfa14c4524…

MALICIOUS

PDF

87.6 KB Created: 2021-09-18 17:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d895aab704988b268079458835359cbc SHA-1: 221eaaff3b0b8a0c6bd3131e49338bec35117dda SHA-256: f284c1bfa14c45241179b4fab1eac18d8a0317740587011d94e8597e5af4b5df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lure users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=windows+7+32+bit+iso+image PDF link annotation
    • https://truongthanhco.vn/webroot/img/files/madiliwiporenajoxosumo.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/mologepe.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/kobawerojevox.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-14/20210914133748169497.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/wagaba.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/buwozusavogelaze.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/nutid.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/magusosumizejexov.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7a23ec548---gekaxajidovoxa.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/21795285119.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/92855446436.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109051848481756.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/33038622678.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/talugoxosimeguro.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/lujamufawu.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/rotuvovipig.pdfIn PDF document text
    • http://belloverde.net/emailer/file/65520666474.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/dugogati.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/ce661ff7383f521f317c0e67dc8bb130/basutotitoj.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/58626069348.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/5664f39d724f5cb287118d9f8d1c5b96/46557369592.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/lelagiz.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/futasekerisidefatisebaxix.pdfIn PDF document text
    • https://soechi.net/userfiles/file/wexujupipolisuza.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_off0000e0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CA 14776 bytes
SHA-256: b0b264958457a7c81725fbebb88d7b3d68e88f74280aa812ff81237b7f5a2baa
font_01_sfnt_off0001067d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8F 19268 bytes
SHA-256: 245dc3410e4158d9c18f8b6a9d250dff908fcc3f5a51fd434b852088317f938b

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