Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d941ecda35f076…

MALICIOUS

PDF

90.5 KB Created: 2021-09-10 10:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 44e7ff9fdc036f5173b907e71ddd10f3 SHA-1: 4b8973cfa0eaeeaa594a8e5201bafe2d5c3ae1c7 SHA-256: e8d941ecda35f076dbe70af49c75b29bd581d49f016bdc90850a6edb60b072f0
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a likely attempt to redirect users to malicious content. The presence of multiple external URIs and a link farm suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://schokozentrale.de/idata/jedoberavifol.pdf In PDF document text
    • https://candica.pl/ckfinder/userfiles/files/11324152141.pdfIn PDF document text
    • https://makenie.com/upload/files/diweza.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///zanovaxe.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161394895f15e5---regizexujekefo.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/17380136859.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210901_BC8A99550080619A.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/sjj8oslu5he7013i8n2b9p3pn9/47522861234.pdfIn PDF document text
    • http://flomojapan.com/upload/files/gamukukikem.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/96979934.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/jexatobedoxejikuj.pdfIn PDF document text
    • https://eventaipei.com/upload/files/sigevasumidoxudi.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///6085486311.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/42543108780.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613693f1735bc---pivudowonok.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/nikexoja.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377dd0ac653---4323748183.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/83141529970.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109020554358245.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/96809384441.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/golebodigoweti.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/faxezidoluxatirixezejebat.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/7584907103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=unity+android+development+tutorialPDF 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_off0000f93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11156 10672 bytes
SHA-256: 3eac26a620274b11afad062d9c33a2718a2c7f8025238eb8ba20a36f29be67fd
font_02_sfnt_off000129bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BB 19024 bytes
SHA-256: ba67ba783346789a9ac98d9ba9d442a88319a545e4e41fb5a0384e2b3791ec95