Malicious PDF — malware analysis report

Static analysis result for SHA-256 eadd0bfe8884fd78…

MALICIOUS

PDF

83.4 KB Created: 2021-07-20 20:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3dfecb40b9d8791f32a0ab9a0d6be17 SHA-1: 75c7e0920db15d98cb0e6f9c66043ffbbef43ff5 SHA-256: eadd0bfe8884fd78f811c03a501e8f163f0ce7f0f0038e30aeabf9f7fbe488c1
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, while numerous, do not form a coherent document body, reinforcing the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://thecobbfr.com/clients/4/43/4363d5a08aa72aedcf7f7d4dd0675897/File/85958573301.pdf
    • http://brenno-tojestto.pl/userfiles/file/diweruxuf.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/l47r8ljfcbkjbv6o9rh286p9l3/gosomaforunevibe.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080232ed766c---gofezotodijedoviwosowinaf.pdf
    • http://dnepropress.net/files/file/10702602566.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/68bacdebd70afca5c199f05ac6a6ec5d/jugunu.pdf
    • https://alnahamgroup.com/userfiles/file/noxunosulegaregigaziziti.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/6k18ffrapp38h0smm3mf2ons0o/84918182237.pdf
    • https://my-natural-style.net/upload/files/26634339316.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609416a34448e---xikusogurimobora.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081775740056---23774096539.pdf
    • https://biomedchita.ru/imeg_master/file/texogixiziguzo.pdf
    • https://ecotranslation.ca/upload/editor/file/wikamakuzuzegaru.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f85111b2e---16934071870.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/148ea3a3629b5e4ebc038a6c6675163a/jejelepun.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160983806c88fc---figijakakitobexis.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7703ab9934---faxonifatep.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160cddcc866f45---54914025154.pdf
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/rolotegegopud.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a950a54ee---48892131844.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/2333aef069c41521725ed1b7e7f7864d/poruxive.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/54bad71030d5f98fcb9057db620c716c/wimikefojelurudufejov.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8c057f193---bivifezixuvatadumubalil.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/80eab213745c25684a948baa960a20c2/91746398368.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=texas+drivers+license+study+guide
    • 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_off0000e5fc.bin
ef037739bda879d212b73863a35682f5d2dd7f0a6d6e5a2e00bb805b9f9c56d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FC 16084 bytes
font_01_sfnt_off00010f71.bin
3ccb936d2df9f80c11c515813f2e826fb84d372d98b8ab75a3c22751055797ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F71 10772 bytes
font_02_sfnt_off0001282f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1282F 16792 bytes