Malicious PDF — malware analysis report

Static analysis result for SHA-256 003bb8aa431a3e5d…

MALICIOUS

PDF

81.6 KB Created: 2021-09-08 02:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 934e312b23de32f2198652eaafaae9af SHA-1: e3ad2c4a64cecfa1f1b47ae63f01f5b60cd5d6e3 SHA-256: 003bb8aa431a3e5ddd7740de5eb00550078e3df8f7bd27ba1804481f39409f7b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to host malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, likely to evade detection and distribute malware or phishing lures. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb02a99082f---56043786129.pdf In PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/korbp4qjq1r0o5tq0l8825iiq6/pajafevigadimasazo.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa65d8bb4fa---munoje.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/if132am1b0nnng432bu0s4ng27/69652266692.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db4d5e4221c---fifobokefazik.pdfPDF link annotation
    • http://inwallendorf.de/userfiles/file/15769180576.pdfIn PDF document text
    • http://jadeite.ru/images/file/49083007136.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/babetalepibobomez.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/2e84b8fb73f409864888b27fb98b77c8/52807898159.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608222010ac90---20534331982.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/dirikavitel.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/wubasakobijuneno.pdfIn PDF document text
    • https://esvigo.com/upload/files/93523122477.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/6c2a2qk7eau7bh6oq5h5l2uka7/xotamidebitibob.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/61415096549.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b52039b8e43---9777989198.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/43131021377.pdfIn PDF document text
    • http://prestopc.it/upload/file/89116001380.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/19070820375.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f4e7dd35c---76857450194.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160a341802cc55---40706891206.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/wisoxenibumojobunim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=junit+complete+tutorial+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_off0000da41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA41 10704 bytes
SHA-256: b48efa2e0edcf45dc488ff371bb980eea55a03baad0bc16df6c06e0346376dac
font_01_sfnt_off0000f2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D0 17716 bytes
SHA-256: 1c568b179ab14f4286c4b2352c4b107ded6ea5e19289bc73afd7b5682d6104ce
font_02_sfnt_off00012134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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