Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf50de5a7affdfe2…

MALICIOUS

PDF

88.6 KB Created: 2021-07-17 20:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 94ce6adc2faeb00a182d2124e7a4f58f SHA-1: c40d2e94e6f1724d849b1c60adbdaebb3599b476 SHA-256: cf50de5a7affdfe24fd68be7bb6d471b209200db4803d3afdfdaaf38cfa27c40
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which appear to be part of a link farm hosted on potentially compromised or disposable domains. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade static analysis. ClamAV detection and ML classification further support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://blpest.com/UserFiles/file/zoburaxibiferowujugezo.pdf In PDF document text
    • http://evohome.pl/userfiles/file/74624227074.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070aaea73ceb---81417655085.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/gagesidesitodexasos.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/48602762522.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/70554299790.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/55593633291.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021062800332034.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/95895502924.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609832d8e81f1---75905299788.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/regapevomunoduwaju.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2de97c4b---61992496394.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/0cf6c8217f7f49ce760bbd70dafcea01/rewegezoguwejire.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/rk3hemdlsblkig7trcq0mkpc0u/34858528882.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/jokisezofu.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/46939804659.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0c0bd500f1a97320195accc3884e0e05/26106838505.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/52028879398.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb61f02aafa---59840967535.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/luroxovojixeka.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/t2ojsi0ka4onlikll13l3od8uq/1023641096.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd2cec9972---zonegodesasowivubil.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/49203f1efdda6b04ec8497d35c6af123/maginavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=minecraft+java+edition+pc+download+freePDF 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_off0000f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 17556 bytes
SHA-256: 002ccc924980848111e92e4c4f16209c8d98add953d4cea9d5224dd6bba2a801
font_01_sfnt_off0001244b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244B 10720 bytes
SHA-256: 5c643a0e1dcf4f54154c7ce5cb59092344c79cfa5ef76805cc8ede62924f4e5f
font_02_sfnt_off00013d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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