Malicious PDF — malware analysis report

Static analysis result for SHA-256 a030f135875aeadc…

MALICIOUS

PDF

78.2 KB Created: 2021-09-25 03:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: da36d9f03172ad0d79fccebd64d12e28 SHA-1: 277fd6fe6333f7cce4bb1a6ecbc52b6bfb3645d2 SHA-256: a030f135875aeadc76ca68532fe7715f08d582efb4e110816da7372901a1f32b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files, many hosted on domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and embedded URLs point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://zge-led.com/luodan/images/userfiles/file/gimipojez.pdf In PDF document text
    • http://cdwy028.com/uploadfile/file/20210920090811.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/vojubujalelenit.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/jowuzodanoxokexu.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/zedojusasaxax.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/metovulitigononole.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/80322541980.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210917/file/43135750117.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/14603021544.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/junovubigukafukodo.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/moziwemejunomedapuw.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090908490219.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/v5pv7tom2rqb8p9igops49nfaf/tisobigexofibo.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/dd7b690d6c9b7aa9f12d371ccbba268b/26701714474.pdfIn PDF document text
    • http://webs123.com/userfiles/file/49715884034.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/jagolifedulapirulawus.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/82786510183.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/91562768389.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614b849a2f079---jiwetuni.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/77665697915.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/febakasezinovikek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=prince+of+persia+6+game+free+download+for+pc+full+versionPDF 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_off0000c1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BA 20208 bytes
SHA-256: 65e36a68e3358fb617f1c3541344b37bb27bb0aadb946e3d0d8febae3e0e81c2
font_02_sfnt_off00010e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E59 11284 bytes
SHA-256: eedd81a8d398cd5d9b35e791db528af7033f4275caf6ee6f8c2b1b8dad9f831c