Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9b2b09c4c07258…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 18:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 60f2067155fed1a80f139b13ed7427b7 SHA-1: 0b937a33bfad84b296f19b0d4119279ad7e246b8 SHA-256: bc9b2b09c4c07258055a8423824ab8ff292df24bf1f887b1ae2ba79933360b71
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by a machine learning classifier and ClamAV, with the latter flagging it as Pdf.Phishing.Trojan. Heuristics indicate the PDF contains a link farm and a visual download button, suggesting a phishing or malware distribution attempt. Several extracted URLs point to compromised WordPress sites or disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=bloons+td+6+mod+apk+free+download PDF link annotation
    • https://marwaservicecenter.com/nbloom/fckuploads/file/88028650045.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/9c31e640470f64b5b69bac932c99c2b6/pukuvev.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/20037252972.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/bojogipitizuwon.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/neseridup.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/diromafazajiwel.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/78011979119.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16147203833bdf---32493703066.pdfIn PDF document text
    • http://koala-al.com/d/files/35063103896.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/kugab.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/sinajigi.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/81125455434.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/nijevifedika.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/f53527e0b5a8e5d9d33bd05643e579e2/kawexejupametukawopoluvix.pdfIn PDF document text
    • http://teraval.cz/res/file/tiduwawemevexazaguwovuzi.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/bisimuxuzafuvasenupazopun.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/46241766619.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/tumiwudot.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/281f3d7abea0aa3ada111d5885fd7c17/lotamekutowopi.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/28723863067.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/1206081314.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/wikanunad.pdfIn PDF document text
    • https://kultmotor.hu/images/files/siwuzos.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/gamusigaja.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161470262792ec---59986237178.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_off0000d5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F5 10968 bytes
SHA-256: f554d1b0a9eede3fe3fda7c9214dce17a64d69b9919faeb1311ef7b4706d4d5a
font_01_sfnt_off0000ef86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10798 17088 bytes
SHA-256: bb63c5ed9e1c4776e71612e9e1bb395e0bf4404c8f6cea442c6287b0c2fa9c73

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