Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36f219286ce7fb5…

MALICIOUS

PDF

70.2 KB Created: 2021-09-27 08:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d2ba6cd20765351a0cf272b8de9a901d SHA-1: 632490bc06f9e74255269c3282c1d22ef5c3f060 SHA-256: a36f219286ce7fb524451b6a5fff9da3181e1dfd4187b0980863c2710b217844
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=weather+app+for+android+download PDF link annotation
    • http://niengrangchuyensau.com/upload/contentFile/file/naliporimakovupafevitir.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/negewuranul.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/3522291362.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/hqtujs95qfrbnn35hjhva4m2c7/sojebixevafu.pdfIn PDF document text
    • https://greenways.at/userfiles/file/72568262162.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/nexaba.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/11317792494.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/sotujogizalalexop.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/19633172248.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/vegefuribonewanonotufu.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210923_775D3AD34CDB9467.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/6pgjavmgdtt4th1g4925en7srm/24521317523.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614d3322b4708---maxaxebexifodivujifude.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/20157663479.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/88462414906.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/fugubelewageboluti.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/wazivamodojomobebade.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/29604302984.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/oc8gjmphcsd4m1iovc1hh5itf2/niruxozesixavalavevap.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/newejebibebirupidusozej.pdfIn PDF document text
    • http://tipiland.net/upload/file/34817392659.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/76882510380.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_off0000b1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DD 10508 bytes
SHA-256: c36da2444e10f5f358c3fe3997b0500a4136514ae3fc89552418348b0675eb57
font_01_sfnt_off0000c9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B2 16384 bytes
SHA-256: 8cb8d49738745923098eeec3a95dd5d2ed575eb1e34142ab56344f942e7ee93f
font_02_sfnt_off0000f35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.