Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89d70d082d03ca1…

MALICIOUS

PDF

78.7 KB Created: 2021-09-18 00:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d227fd0f062b4d4fb98870b68094e265 SHA-1: d6cb3db098f99c038f9177e646780a6a1da7d742 SHA-256: c89d70d082d03ca10749436c306e720e9e3718fdc338626798f1edd2cf3e9d10
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://panda-es.tokyo/yamituki-n/uploads/files/13125281843.pdf In PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/g8k4pfg47qvjd8odqmvijuablm/kitofanibi.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/63205871983.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/47933297892.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8e742737cc298c276b94628a90d8d091/8429788181.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/gamiwegas.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/zigetezepoxoza.pdfIn PDF document text
    • http://blgjad.com/upload/files/4047157998.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/gibuzugonogutitizokuwo.pdfIn PDF document text
    • http://gysanya.com/upload/file/210907203014948655zcsuonhlboul.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/99070866269.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/72337126737.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/pepixubufanikuxawipa.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137df6323d98---89378628644.pdfIn PDF document text
    • http://scarpatti.com/files/43097876187.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/5039011532.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/30901193909.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/39165085771.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/votizofonowa.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021918550223396.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/jedogibimaposoden.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/22418474326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=best+app+to+mirror+android+to+apple+tvPDF 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_off0000cea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 10672 bytes
SHA-256: 29ad49be6f95e5649087dd30b15ac5b4ff6a28ee5d40f126d2646c8f467c26f1
font_02_sfnt_off0000ff34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF34 17588 bytes
SHA-256: 9c31e0b13f88dae0659d75247357d170ca83788b3d2b99a6f16a800edbc94e07