Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40dc14bb420df9e…

MALICIOUS

PDF

74.7 KB Created: 2021-10-01 10:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5abc703b457c69a2ec9d2d22f95b4f02 SHA-1: 938351b2167402b5cc8fc68aeb2ab5354d8c1dd4 SHA-256: d40dc14bb420df9e09667e2051b61e4483ab2b0b0212e9f25b9eeeca7f325602
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/sehdsb9mouh5lhgsmbaf6uo9m1/fizunemisulu.pdf In PDF document text
    • http://pastoret.it/userfiles/files/64561297171.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/bajafisevesom.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/vonalumo.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/pizurumudesojeg.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/zawuwopizulixawufapiripem.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/ronorikerimuranewapol.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/b76530f555f3c2bc7f200a182650075a/68860220106.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/52kjvlofv5ht60ilrh4kqp4oem/84585000651.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b6c6cf769---bugepovafolenawubozo.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/61441161281.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/boredovijati.pdfIn PDF document text
    • https://theipbuzz.com/images/file/30015022802.pdfIn PDF document text
    • http://snsi.jp/image/news_file/49723643559.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/vobigonifa.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/tubarusibemuwevozujitetus.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/405731896.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/86013697677.pdfIn PDF document text
    • http://xn--42ci4cc0aric4a6dd7c5af9nef7sg.com/userfiles/files/novilevamosojuwakawe.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/87975795031.pdfIn PDF document text
    • http://micruts.org/userfiles/file/68404702319.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/23225946858.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/dezonizof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=comparaison+iphone+et+androidPDF 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_off0000bc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3B 18656 bytes
SHA-256: 8ce5bcbd23de64620c2460853f823dc0f4f658cb93404682cf5f42247470bee3
font_01_sfnt_off0000ecb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 10640 bytes
SHA-256: 644f107abf49f48cdba87bf15ce520c6d33890bd455285d477c500c80d20976e
font_02_sfnt_off000104db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1