Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c50077b6c56e4d7…

MALICIOUS

PDF

85.5 KB Created: 2021-08-25 03:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eeda16ef37f266caa24e80c7e7b860a1 SHA-1: 33bd426ac3d04a27a8ad95b514b32d98c9640bdb SHA-256: 9c50077b6c56e4d76f53ef7832df9d0224562d095cda82c06a560ba7fe55558e
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple heuristics indicate malicious intent, including a critical finding for requesting recovery secrets. The embedded JavaScript likely facilitates the phishing attempt by interacting with the user or downloading further malicious content. The presence of numerous URLs, many pointing to compromised or disposable hosting, further supports a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 9

  • 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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://yarpaket.ru/userfiles/file/jijilufaburoveginev.pdf In PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adb4213cce6---19476224968.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/sabomijakebozomanoxirova.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/61427886723.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/76476114021.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/kikewefijutubanuvas.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/0127bb5ce6d03bf3486f329d942e1748/kamawejekapidimiloj.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075463355a94---wowukolivasosumodorewutem.pdfIn PDF document text
    • http://127.0.0.1/bantraicay/js/ckfinder/userfiles/files/82198920253.pdfPDF link annotation
    • https://jdrum-music.com/uploads/ckfiles/files/53722306991.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/81280934071.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee6db8c1d1---50725144110.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161053871efaa5---78494330681.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/86a694e5cf91b3eeb62fef1c1c1090fb/damowibevijeganisirarazij.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/jodujerajugabirenataxa.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/7216109341.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/74180322943.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9bef52a8b---zuxowadamolanom.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/nadavafod.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/cb215666aa55c4219454a44094069508/91977044447.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/bubatarapok.pdfIn PDF document text
    • https://clubon.top/uploads/files/61617796734.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/92050451766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=acronis+disk+director+manualPDF 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_off0000e754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6B 10704 bytes
SHA-256: 1372d7b9f4786507bcd4d818667a7026f2c68a15776d0a9afda6c525cbda7b04
font_02_sfnt_off000117fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FC 18076 bytes
SHA-256: 69a9160c772e828b0d0bf2ff8d617d22442ee82c2a91067c83bfc233d8869017