Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd067c83b0c9a1ae…

MALICIOUS

PDF

72.5 KB Created: 2021-09-29 04:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76d7277cc05885656e352c8fb5e5e8c5 SHA-1: 60ac5da436fea829d923534448c62aa7f125a465 SHA-256: dd067c83b0c9a1ae0ecf7decf4ac326ea204ac029619695178987f2d7ca1f02b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or spamming campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://crewmak.ru/uplcv?utm_term=where+can+i+watch+the+barbie+movies
    • http://toszegisuli.hu/userfiles/file/10212004622.pdf
    • https://harom.ro/files/file/23110533917.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139083c12734---10365410999.pdf
    • https://newshieldinsurance.com/demo/gsa/final/images/file/66064509996.pdf
    • http://mocphatreal.com/assets/images/ckfinder/files/rejesav.pdf
    • http://cowmoo.org/ckfinder/userfiles/files/74751335459.pdf
    • https://petek.biz/resimler/files/98982302139.pdf
    • http://braciszewska-klimek.pl/fck_files/file/mitutesaferaza.pdf
    • http://rungrawin-itt.com/userfiles/files/88852905600.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/865c768e3c211a2d2149bf472fb4112d/godefafisuxitudo.pdf
    • http://thesciencenetwork.org/uploads/files/rafetisanu.pdf
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/liwubomuzepepof.pdf
    • http://vuason.vn/upload/files/2565615515.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16152b3ec7e102---26680534350.pdf
    • http://kiko168.com/UploadFile/file/20210907050348016.pdf
    • http://shahnawazonline.com/uploads/files/wivujonamozut.pdf
    • http://mcutech.net/files/nijemirulemetib.pdf
    • http://greenglobepms.com/uploads/6971466957.pdf
    • http://efuturesthai.com/uploads/file/36539726274.pdf
    • https://mycocoa.org/images/upload/files/juliwufavazedurejururador.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/50255096140.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/87d8f597d45b1df3c06e3088b8b67914/mevan.pdf
    • https://hygradeinsulators.com/images/uploads/file/ragezibazenubuzi.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614883a4392f1.pdf
    • http://dirpub.org/editor/ckfinder/userfiles/files/sawoluxapalavifu.pdf
    • https://sapthagireesyathra.com/userfiles/file/gulobogelazom.pdf
    • http://club-integra.ru/userfiles/file/53257471083.pdf
    • 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_off0000b5c9.bin
9b78220b546941ad46ecbeb0d6d2af125215b8a3b20eb055149529b07e5913c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C9 10732 bytes
font_01_sfnt_off0000ce5c.bin
e36f9c6a7cb89270becc33a0e9c4c916260e5859498b6448c7a31c7d6d0cc59e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5C 17988 bytes
font_02_sfnt_off0000fc0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0F 16792 bytes