Malicious PDF — malware analysis report

Static analysis result for SHA-256 159b00fd1f0abc11…

MALICIOUS

PDF

138.8 KB Created: 2021-07-02 07:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e70fae4f7f361fdd18389260fa17525f SHA-1: 3f89ee56ff4ff44f6bbd6866086d2afe419a9666 SHA-256: 159b00fd1f0abc1195192e1aa129aab104c6e6a8a29d53d4ac4f2b8ad189cff8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The presence of link farms on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9303

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 https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/a173987f20ee9c6b286e7d838ee04bc8/51754068186.pdf In PDF document text
    • http://baigeleather.com/userfiles/file/34954396750.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec0dc7bb22---10215272815.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/69300849413.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc78400cfe3---88876794451.pdfIn PDF document text
    • https://caffedisanto.it/file/jizirixaw.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/24442794360.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160dc10140dd70---boludofitiwosopawas.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/a6cbcej8iajcgpti5t3pida3q6/seramadurati.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a629e7a169---wikev.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/21477893422.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/65324540514.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/e6e394e333f9b9856ddc2a921ca6519a/71488611423.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/7a5e9ca8f058b15be1dba66c80159c48/27050868127.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf1dac9d03---fefisokasulelisodu.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/bb9772fe35a9f20720680613339223ed/gezeredolemuw.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/0cf580132f31588d6f38912b122146d4/6869268152.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160704a906ccf9---mizasikawofasu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/u7fo5vqdjrmq2md3cdghc785o1/36247451579.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160747c9d4bb69---84919731643.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/60915611913.pdfIn PDF document text
    • http://fdceta02.fr/catalogue_dynamique/file/58893361997.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/rukomadipigepovomolepidu.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/50b81b9dedb4a166aa1f12114c7620b5/zeregomakitofikovawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=i+ching+the+classic+of+changesPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000161d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161D2 10464 bytes
SHA-256: 6fa5685253482fedd92c5fd0f4c93292edac2088e9a61d7789e0be287dfb1c18
font_01_sfnt_off00017984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17984 16784 bytes
SHA-256: fe71562ef627a97d77e1976bd8ba7a848e903f15482a3803215694574864b367
font_02_sfnt_off00018fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FBD 20832 bytes
SHA-256: 5b5e99ce55e9d3c1c7af4c6347a2a34b826714f6a3299cb02a60e63552ac4341
font_03_sfnt_off0001c2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2CB 23576 bytes
SHA-256: 0d4317c7265c19f57e4a90c58b099c74c3e8d2ede5c0d6b5b63db11e3ad79526
font_04_sfnt_off00020491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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