Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ae59391089f59b…

MALICIOUS

PDF

73.8 KB Created: 2021-09-11 01:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1b33ae389c0a6680bc58dfe58c5f7442 SHA-1: 8383b31e8983636cd9016e2a7712adf2208c31b2 SHA-256: b8ae59391089f59b2a3474a3de86db3307911aedef2860b9fc8833fd690f7190
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating a likely attempt to redirect users to malicious or compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure points to a malicious document designed to exploit users via external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://irlanc.ru/uplcv?utm_term=pokemon+sword+and+shield+3ds+rom PDF link annotation
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332484486b1---37304975899.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/xalowulaxijumatudo.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/90964106234.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16137da36dc51e---29873640511.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/70351460255.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/38057321238.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/3b13656ad2aaece76ca728925462fc75/wibudumoxizapepazapuwogu.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/54069600708.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/mikov.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/wejubekodisikutasukexurel.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/69ea5033d6e08e98c78517b0908e66bf/logobizojefemijifozafu.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/24649984308.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/95409006366.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/fevebavafutizavib.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/36687927337.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/muvatonafuwoneted.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/mojesivasowebegevegi.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137d290a34bd---13252810995.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/voxigidavetu.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/pipezaze.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_off0000b8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BC 10764 bytes
SHA-256: 5f92090af481e783904f30d99e9ca75f1612ce1b25136c71959365bc2fa77ee0
font_02_sfnt_off0000e95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95B 18584 bytes
SHA-256: 3398f1f3b632d9d537809a9fcd4112c11a5634da2444cbe60d3a35c1e96c8101