Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c1022f5a09c365…

MALICIOUS

PDF

85.9 KB Created: 2021-07-09 12:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 62c61712ec80306e0f2b516e6a2229dc SHA-1: a2978cc15e61071bda3d3d9b7895d2068624f57c SHA-256: d0c1022f5a09c36501a426b5beec85e514a51476f7d04e1b083a9190ad4fcf59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which appear to be compromised websites hosting PDF files. The ML classifier and ClamAV detection strongly indicate maliciousness, with the link farm heuristic suggesting a method for distributing malicious content or phishing lures. The presence of multiple PDF files hosted on what appear to be compromised CMS upload directories points towards a coordinated effort to host and distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://szkolaprzybranowo.pl/ckfinder/userfiles/files/gejakajema.pdf In PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b547196586b---jujuzolinizipevolirarotix.pdfIn PDF document text
    • http://fabtur.ru/upload/files/89417480215.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/lepot.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/danitilobudinalokeguz.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/9261974336.pdfIn PDF document text
    • http://mextro.de/upload/files/62451902735.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870220eede1---dolizosakonefubabetomugep.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/tozizasemiwuro.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a676b5aab98---zufazoropafaru.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/279c745c083483e9b186711930a72db2/53260037750.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/42254435884.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/754f559daa13e50509194bdb16e9f87d/janozesidixovuwin.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/figapenojat.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/mosaje.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/70fe4c350cf529afe909da8ebb9f1d29/65071967369.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/65fb67bba0f10fdc4bdcdf01605f798b/40983945466.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769522637cf---55501014883.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868821e97bf---bukojaxikokel.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/zefevisob.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607933b21c173---53282474133.pdfIn PDF document text
    • http://www.520amis.com/upload/files/reradanu.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d54ca0c01---80318855279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=4+letter+word+forPDF 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://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_off0000f45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 17660 bytes
SHA-256: 6f46edf7e33e1e9aab2a2a38a8744fd98ffeec4121ddec181ce4ea3de65143ab
font_01_sfnt_off0001225e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A74 9888 bytes
SHA-256: d16951539595f12b3f2c8442a40553cbeb201308dbe062d4ac9ff764f66d5c96

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