Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a0b24791ed5929…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 21:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0a2d971cdd426550dc0b2aba343b0abf SHA-1: 7c4b3dd6e9c22d3be747177378f9cdc6ad14064d SHA-256: b5a0b24791ed5929904536d4f465662b4dd2a88511976ce4b32d17ed2afa592d
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and does not provide clear instructions, but the presence of numerous links to potentially malicious sites is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160881938ea680---94515119410.pdf In PDF document text
    • http://chapraptti.org/userfiles/file/fosurepoposalijujavavenad.pdfIn PDF document text
    • http://patokapugsnkisses.com/clients/61143/File/molapuvajixi.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160db25b4a1023---takozogipufideses.pdfIn PDF document text
    • https://ei-hotel.com/free_images/files/26645992195.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/328784a2f1b182e77703d731817feb42/bedezoluw.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/noratonemozofipiwafoxaw.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2a668cd979c782ead5c3c90b6e1131d6/xumafarupero.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/xedesudobusenirosubaxita.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/nutesikefimezij.pdfIn PDF document text
    • http://lnyy.cc/uploads/file/1629782157.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/e0d07b21e0261b839afa67432c779cf3/jugofodoputaz.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///96637598586.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210509110408.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/kidijizapolapov.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d2cf3680ba7---joxuzanadof.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/monemuzas.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/vufekuwafaripabu.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/78406263695.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608b881773c66---94563081919.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b871e76ad83---39000220446.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732023ea905---zorenezefine.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/desurowupojiferevulo.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161089ff114348---ketomuroxebafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=spelling+bee+word+list+2018+pdfPDF 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_off0000e078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE078 18352 bytes
SHA-256: 2ac35db24506bdd94735a95229adb56dcec99d8bfacdc27f5a2f6ca28ad97d51
font_01_sfnt_off00011036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11036 11312 bytes
SHA-256: ba90bca4d268678ace428cb924d98eac70ae9bd8b6234286d4ce7ceb3b23e0ea
font_02_sfnt_off00012a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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