Malicious PDF — malware analysis report

Static analysis result for SHA-256 951a8a0ce5c5f606…

MALICIOUS

PDF

116.0 KB Created: 2021-07-22 15:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b8e2dd8b9c4b530b59a816ced13a264f SHA-1: 8f98a891a414c3ef54e1561bb238039dcc76991b SHA-256: 951a8a0ce5c5f606702f6a85a06a6a31fc5fd5f7f2f748fab070a7497fbb9325
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDF files hosted on compromised websites, indicating a link farm or distribution mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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://mobilieroccasion.fr/uploads/file/12505905455.pdf In PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160f8aa5a66295---95014336135.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/04fa3f08f207d9c5f226ce2c35aaef09/vorifunaluxujibotof.pdfIn PDF document text
    • https://medtek.vn/storage/file/wajetisimanonesode.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607849ddaace6---2907334831.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/6c4p92ho2f9uvcsfhcsloa8o63/79438182171.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/50724982961.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/91402973379.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec57b61d82---68262247410.pdfIn PDF document text
    • https://arerp.kr/data/file///7615182689.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/v0u7td4d68i93qm6k41c01fqt3/93021068914.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/jatewibivug.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/be50ab919d219e57885412b615fc2886/43102640340.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/d8glcmgblsdf4ivmnk3h5dl13f/pekefavedaxoderej.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/80177560322.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0717/1be8c39d592313b069ac7fdd98d84693.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/wazodikutivuliwekivajed.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/341ff755ba92af38cd5635407fad005a/lujasedoxabati.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/382f3f038947889808828b69a9ad74cf/97391416081.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d522d59643---jagipasoxabumadepupuxig.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081549078364---wesivuxegupodotazenov.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/qs6n3s5lvndsktdkrc4cktuma4/84704747482.pdfIn PDF document text
    • https://luminex.pl/upload/file/kanomazulabuvoz.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/gexitomufufesuruli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=pirates+of+the+caribbean+the+curse+of+the+black+pearl+in+tamilPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00019d91.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19D91 20448 bytes
SHA-256: 463a5bba91fddbd33380d049db28bcbe178974172f0d1e9468c118d453508382
font_00_sfnt_off0001384f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384F 20596 bytes
SHA-256: fc2a77685a13b3c25ae207f26df6c6ec736c21f21d1af5c1d6473ee7ac73fc30
font_01_sfnt_off00016c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001842d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1842D 11080 bytes
SHA-256: 9e95e653382cfa7dffcc5243f890b67621aefbb49a1d92cc00a2f72097e93890

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