Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee52d8ee4e63e08b…

MALICIOUS

PDF

72.4 KB Created: 2021-09-20 01:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e02cd92362ccaa44060c87be820136b6 SHA-1: 0996fcfcdb81623381b1889264c676ead909043b SHA-256: ee52d8ee4e63e08b88d8cf6ad4fb10fea1662f2a3b29a130e7a421749b4669e4
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical alert for requesting recovery secrets. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the presence of numerous external links, some pointing to compromised CMS uploads, suggests a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://canshu.dlzj.net/upload/files/20210913090739162789.pdf In PDF document text
    • http://www.jasolasia.com/image/upload/File/86833018916.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/38652151810.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/7182744174.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/xabowusodem.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/a7f7afd49f08cd798b347857975c3d12/woxowizofax.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/95463896525.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/lirewajigikazuronekiguf.pdfIn PDF document text
    • https://bselink.com/userfiles/file/9209677964.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109200558496116.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd809289fe---62899009148.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/59483904658.pdfIn PDF document text
    • http://stefani.cz/fck/file/disepexonorus.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/41501504654.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/zetixawuze.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/tezotokawobewo.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/31614785900.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/25912589866.pdfIn PDF document text
    • http://mextro.de/upload/files/weragovikojeduzakofosire.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/35067149277.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/denija.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613115a2248dd---14332154235.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/57984403722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=cordova+build+release+apkPDF 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_off0000b919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12B 16584 bytes
SHA-256: 4afc64cf08e254de3634c1eb81db10a27390e8e905128a5eb88dfb73292f31ef
font_02_sfnt_off0000fbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB6 10612 bytes
SHA-256: 29def60b7fd3fe93544b54e3919fbcfaf7fa0798e85713922c0656b67ddddb4b

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