Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea9b373bee313bf…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 15:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5673096bd13e4a3da5c7b69be58d9c1e SHA-1: d21ba385241772b097fb3ad3d829e5b4e1d77cb6 SHA-256: aea9b373bee313bfefbf977f41e12593d4b2a0c0e08b9b2364e03f933021d342
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of a link to a compromised WordPress upload storage further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://boracayg.com/FileData/ckfinder/files/20210916_7D6DBA7906509D82.pdf In PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/50781921162.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614209c078768---96075495646.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/nirokewukimulina.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/nomiz.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/63941537619.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/rujoviz.pdfIn PDF document text
    • http://intersonik.eu/upload/files/dimixusajemorigomesobopi.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea64d1de10---xinelominatekigefevumaxim.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210903051346_91715703.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/sulafijuzivone.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/46546074297.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/8398367857.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/finukupisuwuxiluxiginulo.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/dowuxetedukusa.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/42944501534.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/jerolajokonekupozodisodup.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130c9d9e5d0b---lulogugefepebod.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/21ce24f29c0a721d4b6096b21478a842/86786375827.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/pudejomefinodas.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340f9d7b2fb---rukujoxina.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/bawosubodezo.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/mudofol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=lightroom+cc+unlockedPDF 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_off0000dbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FA 10636 bytes
SHA-256: bc1cb56d4df79090edda1decefd6188ca7664bf48b1c1caf1aa1ed99bcde7f07
font_02_sfnt_off00010bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDF 16324 bytes
SHA-256: 153c14fe7898bddb22a5b3b5f350e3ac302c5085eb5f54cc154d5355dd37f00e

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