Malicious PDF — malware analysis report

Static analysis result for SHA-256 997e8ce3344c8f7d…

MALICIOUS

PDF

83.8 KB Created: 2021-09-11 10:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 719d9f2e3457ebeebcbb2ff965544b1f SHA-1: 2463edd088b8f5423641cff33f0470893458bd97 SHA-256: 997e8ce3344c8f7d8359f8660ab0f577c0011df95b378e26eb303a6556888ed1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The sample contains numerous embedded URLs pointing to compromised websites, indicating a likely phishing or malware distribution scheme. The presence of link farms on disposable hosting further supports this assessment.

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://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/3ea7lrn1o7nbv78ea9q60l0rt3/donodine.pdf In PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/kivaruruxid.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/53430102050.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/273406367613612d348b50.pdfIn PDF document text
    • http://poiskvod.ru/images/file/12690834078.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16133637bc8410---94140694759.pdfIn PDF document text
    • http://innotack.com/userfiles/files/zedekumo.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/4765440569.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021912114132831.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/03/42336769959.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/29153888796.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/12266966797.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/sisugobidoziwometo.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/jewoxajexuv.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/sarasunumetafod.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613180fbd92a3---dewowes.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/xuliv.pdfIn PDF document text
    • http://jaatkinson.com/userimages/pukolevaterefor.pdfIn PDF document text
    • http://chinazzjx.com/d/files/rebinigejirazitevefi.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/12280042156.pdfIn PDF document text
    • http://zerosquareonline.com/file/92333070926.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/jugutetozexe.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/pagorujijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=remove+object+from+photo+androidPDF 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_off0000defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70D 19052 bytes
SHA-256: d9fbd926645b683e93219c370132cad0fa189609bb11ece45fe3b7ff69b55e17
font_02_sfnt_off000127f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F9 11052 bytes
SHA-256: 320a7f7b4ccfd63af7b36b3de491623138336dbf90513549d32bba25441a7113