Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c131bd293478d6…

MALICIOUS

PDF

168.8 KB Created: 2021-09-01 22:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3d88700c787614091e91f83644b80296 SHA-1: d8e78a44cf2f9785a6911999f295050cc4d5ee45 SHA-256: b0c131bd293478d6f0ca91e21dbc8e6a778f05e7936615d67b8d0b3dbc9341e4
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple compromised WordPress upload storage locations and other disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://dermatologomiguelgallego.com/miguel/fck/file/85493037292.pdf In PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b2251d1ef---garegovukavinu.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/86295733087.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/94807461641.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/79573806995.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fa9a3704d---tokasunifexekef.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/82367521133.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/44278393459.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd967ac9c4f---30404646106.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d64609bff06---ronivudamo.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///2439860915.pdfIn PDF document text
    • https://masukpt1.com/contents//files/tezowux.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/vugexudepudajobo.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/10071178295.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/78102547632.pdfIn PDF document text
    • http://e-district.org/userfiles/file/wibinezurimizoxudedun.pdfIn PDF document text
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/72034883226.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c056a4a4078---66097533553.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076b195e7305---resuvofaladumilizugokuwe.pdfIn PDF document text
    • http://0930actress.com/files/files/60402786478.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/b8b103436e001e97a09373d92a9b4fdf/18730875372.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/59838154590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=principalities+in+high+placesPDF 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_off000223d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x223D7 25588 bytes
SHA-256: 288aba63c647f2d8fdc1878881af711b0d18c7e2da65a39c4e654138d1480bcf
font_01_sfnt_off0002645a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2645A 10532 bytes
SHA-256: 0b8b5edcf054803abd1cb5ec528b4de0c9ccb7e82de7f7e25585445a7a22f242
font_02_sfnt_off00027c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27C47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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