Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b85add8d793c10d…

MALICIOUS

PDF

84.4 KB Created: 2021-09-02 06:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8eec2b626e70530f74492b7621f78b94 SHA-1: efae1c09c0135f2b6b1f5d348ac1c38cb922b429 SHA-256: 8b85add8d793c10db3db3a4c67d16452a261c00aa42e8ffbbca012de2c4a9a01
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The file's structure and numerous external links align with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://joyearland.com/ckfinder/userfiles/files/56072356696.pdf
    • http://rhodeislandalpha.com/clients/56223/File/nuvatitogatu.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10a4968f1e---4559521310.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612661e02246b---31309019977.pdf
    • http://ehs1958.org/clients/73155/File/49146748125.pdf
    • http://xn--e42bt3l.net/upfile/files/3086729573.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab20bd70075---35648533363.pdf
    • http://consulcongress.it/uploads/assets/file/tifewubog.pdf
    • https://ekransamara.ru/files/fimimapesivikugatuzopu.pdf
    • http://assessmentinsight.com/ckfinder/userfiles/files/gelawubewusosuvimezelijox.pdf
    • http://phsclassof1970.com/clients/875774/File/fuziduxogud.pdf
    • http://hhtaitung.com/CKEdit/upload/files/2755396418.pdf
    • http://mexvp.com/ckfinder/userfiles/files/jilumiwuf.pdf
    • http://jeanthompson.nl/ckfinder/userfiles/files/23646769925.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf9ea5d0d9---lemitofuwotofivunerogixo.pdf
    • http://meble-tk.pl/userfiles/file/15171698263.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bf7ee1c3e---puvewerutigugapu.pdf
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610734d62d6d3---1308590284.pdf
    • https://alubiasdetolosa.com/files/galeria/files/simitid.pdf
    • http://thecargonepal.com/userfiles/file/pogogojuzemuvirijezovufiz.pdf
    • https://nikunjfoundation.org/ckfinder/userfiles/files/18964156836.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b400e4795---46072324212.pdf
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a4c741376---ninapuxefisas.pdf
    • https://pmfegypt.com/userfiles/files/15953080124.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=define+confined+aquifer
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e74e.bin
2ed34c49158be15701e503797fcd86e399c0025720a47c39e799be6b4d827fd1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE74E 16944 bytes
font_01_sfnt_off00011345.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11345 16792 bytes
font_02_sfnt_off00012b5c.bin
4a9df1425f2bee424fc44477914995edd977e91bf8cad795416f4ad7b0e4b410
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5C 10404 bytes