Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b22f0b8667811c1…

MALICIOUS

PDF

87.6 KB Created: 2021-09-05 11:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 42763b4931939ac3ba5d8b5c45463c67 SHA-1: 182aea143d3413a7b4b56d2b9c335c60aece70e8 SHA-256: 2b22f0b8667811c18e4b40934b3fe58ef6a97a4b3ccfc1ec4f19de9286dd2b9a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of external URI heuristics further supports the attack pattern of directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://chromavials.com/d/files/mejewivolabejukegafurib.pdf In PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/32653117469.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/baraxokozebapulodepesorev.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffb637766d---tizuvosiziw.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/8120f409dbbed351c687ca8a9b3e8970/41712882620.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/kegegetegok.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/foludobiguk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcd76008fd---tamizoro.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/20531222376.pdfIn PDF document text
    • http://szwygs.com/upload/didadamusupig.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/31089404148.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/mitexi.pdfIn PDF document text
    • https://netpage.info/userfiles/file/85337046055.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/34553316744.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/xepajoluwuzudusoko.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/02dd3786b51fccef489f6a6310553daf/51837874208.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894550b43cf---zolafuweguxewukonotufa.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081e9cd21684---85166495875.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/jemiperizewufupupowov.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/d640f5a80493106feb69e7237e0f2a52/fijoromobewixu.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/kaxefifuwomef.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/9863942866.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c772227ad40---moxawemevorawiwekofago.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a361495d4---witilepalifiwazugo.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/gbq92caupu52r68kmaep1duen5/fitakisakobefuwifok.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/47957774854.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/1a5dd295372b43f7be13bae43da812ae/73239628357.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/16835812265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=seduction+and+snacks+tara+sivec+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_off0000ee13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10625 18460 bytes
SHA-256: eec3ea136c0a427856c6b898b520bbb7f94380e199f656d96b099723e159ce3e
font_02_sfnt_off000136ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136ED 10900 bytes
SHA-256: 2e7196dbf9da112adc1464e9e97b70db64550189aad9b5004a03abdaa05e6888