Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad02b25f016c4206…

MALICIOUS

PDF

86.6 KB Created: 2021-09-22 14:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c9468f1d02224346747481c05e395338 SHA-1: c020b00d2bb06f9ad52f918b8026fe78b92cedba SHA-256: ad02b25f016c420628cdc27e5c1b8fc6b6617b94bf2b2a578a7b3e187d4c49e6
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://bestofbeer.ru/ckfinder/userfiles/files/nunafe.pdf In PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/kakojavufutumepazitu.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bd36df283---67691366874.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/88463644237.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/70688155051.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614595c6111ce---83706170807.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a040343546---dulexemenofijiwej.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/xekenetorusewitofabuj.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/masimosidibifav.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/juvowizojozaz.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/65302018063.pdfIn PDF document text
    • http://yuhuimachinery.com/d/files/14240769563.pdfIn PDF document text
    • https://equinox-e.com/upload/files/24878141396.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/72314506708.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e63093a33a---nepojuwojijixavujuz.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/fefamidimegiwofe.pdfIn PDF document text
    • https://megashina24.ru/files/files/85923330041.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/15871974684.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55904017243.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7e9d124c5---wugawuw.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/29858423906.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/97204719268.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/0e4864a9c346cb6ca49856937b310a87/ganozadujizoxudiw.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/xupanivalosu.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/juwekiwekawekojutogizemin.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210921191208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=very+loud+ringtones+for+android+phonesPDF 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_off0000ec87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC87 10960 bytes
SHA-256: 6880428ade06362f23a628aac17de909af47a8a61ae10998e74bffec8ac6200f
font_01_sfnt_off000105af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AF 17812 bytes
SHA-256: de31376805fa09aca9bce087580f200383593293b3bc2125e6692a729cf08ed4
font_02_sfnt_off00013424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1