Malicious PDF — malware analysis report

Static analysis result for SHA-256 1870d53964204722…

MALICIOUS

PDF

131.8 KB Created: 2021-07-28 11:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5af65f8c68e42fd32ea2659be373794f SHA-1: a9fbabea1156470662d69cdcf6f52ce9632b45c5 SHA-256: 1870d53964204722cdbfbf52015b3601238e8d4cefb84e92bc21b87af2b7f368
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on compromised WordPress sites and disposable domains, indicating a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute malware or engage in phishing. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607641fa8e7ad---ludakufede.pdf In PDF document text
    • https://everestart.com/images/stories/file/bomedujetomulasazogoruvag.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/19949345878.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f79b1787b35---5621751587.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/didugubo.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/zovewipubide.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609196d2851d9---jupemuduzevigobo.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/86114845194.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076125d242f5---galosewuwizefaduzel.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/33017466640.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/paduvofopu.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/30861567374.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fe278b56027---magezaruwelopigomorirumuf.pdfIn PDF document text
    • https://hgb.se/filer/file/37832923528.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/gerogetisepugiwuxazutaza.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/b9e86ba0d0c9386e0db819ce39929705/mawogerifedise.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609006bcd873e---zajujirozibodulirerobibe.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/93054659892.pdfIn PDF document text
    • http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/nekarunulawesorap.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608544368ed2b---51534582732.pdfIn PDF document text
    • https://dhesient.com/media/duretubefakoretabafizadel.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/lomadedidixoderol.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/kumurosonuzeraki.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210718_9F3A6682B876A00F.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/bef68a6234935988aa5141e286969d95/98120307484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+hierophant+reversed+how+someone+feels+about+youPDF 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_off0001a4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4E5 11232 bytes
SHA-256: 37c62c872c455ec3b406fced87c850f5f16ac1a3e3ab0e4063b95e597c66422b
font_01_sfnt_off0001bee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEE6 16300 bytes
SHA-256: 89e9f614bbfd1d92f0d90ad630255672d67d817debcedaf2b776cb764fa1cd3d
font_02_sfnt_off0001e8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E8DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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