Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85789689cf6d05b…

MALICIOUS

PDF

79.3 KB Created: 2021-09-04 21:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f00a31eccf023f7380efd8a97b67007b SHA-1: 915cf8ae6dc26f0e1bc7aa51a2e4e0d42fc42fb3 SHA-256: f85789689cf6d05b44a1794c4836cfd33fb919c38aa30f0da0f86f2c34ff2fc7
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and other domains hosting PDF files. This structure is indicative of a link farm designed to manipulate search engine rankings or to lure users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely phishing or a trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/99331757c69f22a1d225878243bc99d4/35099675060.pdf In PDF document text
    • https://cobrawire.com/userfiles/files/jasunininox.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607893ad0f971---12934271225.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/17080433725.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/70648484973.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/6764657274.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d06382c2d2---vivenuf.pdfIn PDF document text
    • http://grimastone.ru/files/xeboxal.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/79733829531.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861b2517aba---tivonipiweriluwadige.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/susas.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/lirowowaduxef.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/64746803193.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab1c47fc8d---34860730380.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073a83f98611---86138820754.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609236f5c87c4---tesodusapafalikaratuzot.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac01f6cd2a1---mazazupujupevupajesomer.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921b3f296d4---judajidudavinari.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/kogamiloxolilefajinisira.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a162c4930ac---dudiwiza.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/lutovifijugobafale.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/57a82e32723b412d2a4ea4926fb74d60/99583168835.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630095193_670215e4f3.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=chlor+alkali+technology+pdfPDF 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_off0000d19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B1 10968 bytes
SHA-256: 3eeb6b6271ce25f6463bbd92019408f29897994f4f430c78af13c7b4c4d79af0
font_02_sfnt_off000102ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102ED 17216 bytes
SHA-256: b4184ac38b422fc9d8e285949153d48c7a963c1f14aa2d687521e25d67ef8ce0

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