Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf056ed6ae604564…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 04:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c934ca88d54a3f2048691f335a15bc78 SHA-1: 23c74a3024cda0d189d823470826507d58d2928b SHA-256: cf056ed6ae6045644158a19d51296ae2154fe825a059d23a16e248d0674b1a7d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and utilizing UTM parameters, suggesting a link farm designed to drive traffic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://learningsolution.ca/userfiles/files/kedozufilesosekojoje.pdf In PDF document text
    • http://studiospazioambiente.it/userfiles/files/57580628469.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/gojepagakuvowetonovefug.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/95399861050.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c515c06792e---zizabilorelanezizevum.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/zezatuvajupemobivo.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f90110dae---papivokurezudikolatevebon.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/23aa3c79e01814c5af22cb89f6755f7f/dubeligidenivaxuverujuxot.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/89500800528.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086d8709e103---daxakusa.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/1be1867d66dc60b844ca680428f2c95a/99708374698.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/vmd1oov1vqi3m2j2geu55g71j0/wotemerilamevo.pdfIn PDF document text
    • https://airshow-bg.com/file/36045268347.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/5v24nabe0hljf4opb69lc82tnq/49787438647.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160846d38cfb7c---munameno.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210701_4F15D506A749CDC3.pdfIn PDF document text
    • https://activepymes.com/pub/file/51699714380.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/taromefelibunam.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/91933321945.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/dufunidileroboziwogume.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608800a2378c8---rifudevagixejizisawusi.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/wilarirujolefetefori.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/mn2umg92dqob7596vckt2025j5/sizupedoxefelavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=making+inferences+and+drawing+conclusions+worksheets+4th+gradePDF 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_off0000d30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30D 11104 bytes
SHA-256: ccb6002cc427eaef438a23f57d48977fb5f682ac060dc0f7c6be50e9a7869888
font_01_sfnt_off0000ecc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC7 17820 bytes
SHA-256: 8aad70a81cf821924ce08c6a53adee7b46dc0d805242db0e91ca2d0e85804c9c
font_02_sfnt_off00011b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1