Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b1b96e6fea52e2…

MALICIOUS

PDF

74.5 KB Created: 2021-09-04 10:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: caa63880505c042b29bccf1f4a891bf5 SHA-1: b6fafaa0c79d5ede645ffbec776877b0bd6fb051 SHA-256: e8b1b96e6fea52e216ea9c0019aa01983bcf5559afd264fe78dbd57ebc92099b
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'SE_URGENCY_LURE' suggests the document may attempt to create a false sense of urgency to prompt user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allytemp.ru/uplcv?utm_term=determination+of+ketone+bodies+in+urine+pdf PDF link annotation
    • http://anhbanglaw.com/userfiles/file/lugusufotasaxamowijo.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/binafosulemibimelem.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/22443164836.pdfIn PDF document text
    • http://ipceurope.com/assets/file/jewanawa.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/xerifokokikenur.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/5193257887.pdfIn PDF document text
    • https://thechoose.it/file/jalapivojiduruba.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/2087617531.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/dawejoxo.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/96896223cf50c8184a6eb262fbf6e1b7/ferogi.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/faposexufa.pdfIn PDF document text
    • http://france-ex.com/32915795502.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/wibapanajidudotelixewebu.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/4892850098.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/27357128143.pdfIn PDF document text
    • http://taxfreepoint.com/file/36335476934.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/luwagusagulud.pdfIn PDF document text
    • http://nhs71.com/clients/d/d9/d9c6bfbc4bbdd207836d30c01fe5869c/File/64352102085.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/025b53d6b51251b8a538636daa3b4cb1/67953402590.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/6e561e520a76f9b3929002001a1edc60/powebaxixumo.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/vilezeb.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/12909882281.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1901b5cd82---11730583633.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/fuzememar.pdfIn PDF document text
    • 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_off0000bffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFC 17100 bytes
SHA-256: 888098bcaa98451805ef05c4e2adfa1fecafaccaca8ed8659f67d5a1b5b63606
font_01_sfnt_off0000eb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10360 10948 bytes
SHA-256: 9542bdbf0e4d4c2046057a1cc7f6a9ac5903ac486bfd4f3d04cb282ccbf3304e

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