Malicious PDF — malware analysis report

Static analysis result for SHA-256 b516f9bcc9bb0e88…

MALICIOUS

PDF

81.1 KB Created: 2021-09-05 22:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 74f5b98eddd146fa876554a165500fdc SHA-1: 7a8362429a806e030c1a2cab6ec02ecbfcdd9d58 SHA-256: b516f9bcc9bb0e8825d5183faa5a34db28486dea69dcc311a8665c5929dca5a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/b0ddb1218a0ac9b0a928761ec08a04e3/kukimetajufeto.pdf In PDF document text
    • https://navliecky.net/userfiles/file/vafelusukulipakisadekemep.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210826_161708.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/fe02a8dd3a413c34cb9954fc86dbe0b0/48249043608.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/56452476122.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/89004321065.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ngogqfq0vfirltrcdvedqpumni/dugepiwinopireluxekobimom.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/88f5e71ee22a2ff614ad54934603d877/wofaluxevetonovudekerij.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/8180c57eb4b9ffa1be4277996afda20f/17208677786.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/jajogozuwiveturanuwo.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/supewelivigurab.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210716_5552793FE55C5014.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/97156292922.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/36182391323.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/gimipitowudaj.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/56186801445.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b74048a3949de343537d31f048ac59b1/18940401081.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/bc48b5a37dbb028b430c5dcb1fb5e477/gaperivesizuwiperug.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/bbf79e1d1dbd53f5bc0c69b9442e2e98/33271822616.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/43084225088.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/99205329858.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080c27c6fd37---gojapabovisotaj.pdfIn PDF document text
    • https://noventa.cz/media/files/file/33250792770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=activity+worksheet+for+lkg+classPDF 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_off0000d5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EA 18468 bytes
SHA-256: 62a3ab4f8698bc563e9ed6a1021fde75f9967146dcc083a9f0506564e0713fa5
font_01_sfnt_off00010553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6A 10848 bytes
SHA-256: 70588f199847544fc8daeeca02d7810dd5bfd8ddc4873e26a52b82536c7c9d2a

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