Malicious PDF — malware analysis report

Static analysis result for SHA-256 446a038dd42241e3…

MALICIOUS

PDF

93.9 KB Created: 2021-09-06 11:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ced51196913526ef5105277aeba2cf9d SHA-1: 381fafd37466d42f3279cb75238f4de9d7d9364c SHA-256: 446a038dd42241e3b8fff6127dbdfdf1bfe79857c79092699b4d71501b0f0f24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan distribution intent. No scripts were extracted, but the structure of the PDF and the nature of the URLs point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://noithatsah.com/webroot/img/files/50196398115.pdf In PDF document text
    • http://geologocarmignani.com/userfiles/files/wixaturuwarugaso.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/1665aa2d34997f86be11df5faf61c087/9587506256.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/86939432747.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/94cf264f0b2b5387327eeb3930e56ae1/jifowipilagugorud.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/xolodasogusodijemujovi.pdfIn PDF document text
    • http://penney1970.com/clients/7/74/747debde904cce1d9d58e62e9103e361/File/75652464056.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/dovobiwodeloxi.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/74658971e322e10a8e53a925a327a3cc/1488063628.pdfIn PDF document text
    • http://edisonprivateschool.com/cote_dor_import/admin/ckfinder/userfiles/files/3085032238.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/440e80c253145984f3d46ca5a4c0258c/gafamojabiruwagotila.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16278677656592.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/fe602b01a657354526e1bceb66073ec0/jifemewenudojemikofop.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/40cc5424706d8b9fdaef27ade82e2375/kirolufufatafegafuwexavol.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/90621983475.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162545776538.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/b493a361ddbe76818fd47c1ade16b857/ramizesamogurawixixulas.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/24184759087.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/bakomesutovuno.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f299a5eb02---57776707706.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/zisuwekijikikekazonejema.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105210442584405.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/sh1tn4mfdl4n4mmm4n9eq77vd7/13990163124.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160abf5d9044be---47029676165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=constructivismo+y+socioconstructivismo+resumen+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_off000102c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C0 10884 bytes
SHA-256: 2cf218f776fb44d23efdb960f8266e1c993fce3660b26f48bdb0c10dc003dce5
font_01_sfnt_off00011c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C00 20360 bytes
SHA-256: 7c7241de513ea02d0242fa2d17e42c37ffb90688c6a81704294b2e1a417f65ff
font_02_sfnt_off00014fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1