Malicious PDF — malware analysis report

Static analysis result for SHA-256 230916b88371690f…

MALICIOUS

PDF

83.9 KB Created: 2021-08-07 05:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 72c79e1cb2c0db755a901cb5bfde58f8 SHA-1: 2e3ffec30242b255082476c8add0f4020add22c4 SHA-256: 230916b88371690f1d23ec9b5c2d1ae45211311a781a533f62cfc979c3933b24
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and link farm behavior align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://pk.mo/userfiles/file/rikubositopolevesezewesog.pdf In PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/daadf14272f4f76a0810bc749d8db91d/24635824148.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/65906233384.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/76525018424.pdfIn PDF document text
    • https://oksushidelivery.cl/sitio/public/files/file/25828420145.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/pabepivewirexujaxozex.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/wajosezonom.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/xetik.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c41275ebcf---mijowox.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/38531166343.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/850f54cfb1cd5b2e5d871b07306f3a3c/zopuzudi.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e4a78864d09---26821439536.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/eb5a90ab9d1b7ada3e3e40dd17716100/90247838741.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081abbbc37f3---zupoxib.pdfIn PDF document text
    • https://pasarangroup1.com/contents//files/donodenesenevufivep.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f5c85f8fd---88950067768.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9910730c0a---16767084798.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/us8673ljed0c24n6fmqd3eb6vc/69456249915.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429153617525331.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/qub6rhfd6k8op65o42fj8bat49/wupug.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/7956592507d292a316e8c4e39cece9d2/18045304325.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9ae82205c---7933018407.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/ridodasurofip.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f40aa41db69---32554202047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pesadillas+para+cenar+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_off0000e1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CB 10396 bytes
SHA-256: 9c333f00de97e53e289ae4d6e4b4cab1c06e41e8f9141524b95758885a42a5b7
font_02_sfnt_off00011157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11157 17924 bytes
SHA-256: ba8f84085cf2ecfbfdcbb772815620102b35d60dedbf8cca25ba897f11fb8468

Open this report in the interactive analyzer, or submit your own file for analysis.