Malicious PDF — malware analysis report

Static analysis result for SHA-256 377f2daad6a568f7…

MALICIOUS

PDF

85.0 KB Created: 2021-09-08 19:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: edd61364fed242dd5d28d0fb1a97cfff SHA-1: 995bfb2e55807ee20fc94de0b8576dfd9752c187 SHA-256: 377f2daad6a568f753cfbf355afb40deacbd8fdbd5b3a68119593c9f40d3c7eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://highlander-inn.com/assets/userfiles/files/mipuvelobijakukoz.pdf In PDF document text
    • http://www.rajpuc.pl/pics/file/23921950194.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161373e2a103bb---vozabusa.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/42251738544.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/37811612494.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/julimagesuzaboxuli.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/riniraxevo.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/soxozupubufagesuvawibileb.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/81323652038.pdfIn PDF document text
    • https://andhimazhai.com/images/files/86475422628.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/58874704951.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/611va41hqufhn3d20b0fsk7fj2/firomomudipibowavelim.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/46037264457.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/fafunorizitag.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/xakelonogoxefobe.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/50426427707.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/busilizimobufezub.pdfIn PDF document text
    • http://klenderbio.com/upload/files/sozexusog.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/52391805636.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/68048212258.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/tofotibofita.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/51ed121980dadd0c81ef305268f4ad05/wazagetoge.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/musisofitasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=anestesia+en+trasplante+de+cornea+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_off0000e255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE255 10596 bytes
SHA-256: d6b3f4e7458e7d7e950afe7cf56f7957bd5233318d6ec00f7bbbe8b1a5942ebf
font_01_sfnt_off0000faa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA7 19928 bytes
SHA-256: 7474d69ec4f62c0354055e2f4ecf7ec2b82592e7b995c5ab275fb3b54a7715a6
font_02_sfnt_off00012ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1