Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5817dbe1aac3d9…

MALICIOUS

PDF

83.2 KB Created: 2021-09-23 15:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5d20104786af6692a5ff4b8e6243ac5 SHA-1: 4018390924c331ffee8021849f1b8c50c15ed021 SHA-256: 1f5817dbe1aac3d9c82efcb44212e1cb71191ce5ff753e396e91ddfd8c6a9fcd
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution attempt. It contains numerous embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=android+phone+force+restart PDF link annotation
    • http://st-ark.it/userfiles/files/towujikalofodot.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/88711781619.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/9073821237.pdfIn PDF document text
    • https://festacontinua.it/public/file/9606314058.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/65427337370.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/45654462951.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/wogof.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/69024673791.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/65057378100.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210903_8871C0DA4C444D4C.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef1498e1e5---wiwosomevejesapowurosulo.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/ded81f8f23613b5e2a1e924dd8f96290/75353170121.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/xupojolirumugorosunijidi.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/38004232867.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/mabivijefobag.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109101051576090.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/xukinofirowaboxe.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136622ccf8bc---32517845757.pdfIn PDF document text
    • http://isvpro.com/custom/files/gevedipevulu.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/vavibujiroduredaw.pdfIn PDF document text
    • http://budget-pl.com/ckfinder/userfiles/files/66873513187.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/tixoxotavuxe.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161426327e10fb---jetanoxubekixa.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/86094615244.pdfIn PDF document text
    • https://atrax.hr/files/25948180601.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/47556362800.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_off0000e144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95B 10652 bytes
SHA-256: e8eac96ddb6562bb0a1dbd4c7f6958f5a70793fb0534c369fed9fbce60640e8d
font_02_sfnt_off000111b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B0 17712 bytes
SHA-256: 45bee080f24139cf3978c01a4348c5181f84dbc7e381682702f80bf2d5c9926c

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