Malicious PDF — malware analysis report

Static analysis result for SHA-256 9336978afd2c5830…

MALICIOUS

PDF

87.3 KB Created: 2021-09-12 03:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bc16169c060c348324e1323e5c6875f0 SHA-1: 53f2a36139309304a93410460836666d4a499f07 SHA-256: 9336978afd2c58304cfb823c8875bb91e609bb78ee7816285ae98ac1a988891b
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to solicit sensitive recovery information from the user. The presence of numerous unknown URLs, many hosted on compromised or disposable domains, suggests a phishing campaign aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac06bb169---moxawenuwe.pdf In PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/13289041912.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/15029728850.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/todoto.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///wugutoroki.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/nesatakupalujanu.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/baxurirofaful.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/koselatenixelum.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/zeselesa.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/95551551605.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/61565155326.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/vorojajasapasulek.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/uikqkk0r5euvstnbsej74a1cqs/gufufixevu.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/tulufubudoxigetuje.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/59454062310.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/21184082680.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/20303db8537f87d2f061cd3c856475de/positigek.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/5501315943.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/11954488407.pdfIn PDF document text
    • http://taociren.com/upload/file/21090100255355887728az5315sk45.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/84118620536.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/naguboj.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/53982677150.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/gogusiruwuwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+crack+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_off0000ed95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED95 19464 bytes
SHA-256: f54883ad28982cd2de3654558b96b41df00520f508d737a0977a8d719d98e03f
font_01_sfnt_off0001216d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216D 9992 bytes
SHA-256: a850420757808e114351abc2bb2d45d97757a38e9fd4657e1510814c42af4507
font_02_sfnt_off000137c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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