Malicious PDF — malware analysis report

Static analysis result for SHA-256 706149cca0dbe381…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 17:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4a7174c93fad890f53611f1d21a3f7d2 SHA-1: 31714bbd17b9d5b2062ac1da9933af12e6d675bf SHA-256: 706149cca0dbe381dc09bafb30fb5a872f273e6d423779315b110b0079051dd7
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress installations and disposable domains, suggesting an attempt to distribute further malicious content. The ML classifier strongly indicates malicious intent, and the presence of embedded URIs further supports this. No scripts were extracted, but the overall pattern suggests a lure to download additional malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://lex.tj/img/file/83950075411.pdf In PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/divazudife.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4db52d83d7---nowozewomegew.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/63923173258.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ce4123ee7---jimomozuwufimi.pdfPDF link annotation
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/6011d0c8b1f05c4882f8c136f6778850/muxinujuxowoziv.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bf8dbe64b---8272412302.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a92ab1e7fc5---duvisatogovudusofopixider.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/jijitebetipulamubobigaro.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/cd99fc47d2f078acb27e2d59d95a8707/sedofoxizomubivuzatewov.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/85936457274.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/vedukusewel.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/rajanafubawogowifiraf.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612810eaf3dba---87978773822.pdfIn PDF document text
    • http://cathayred-csr.com/img-cathay/files/gixur.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160974fbdc26cf---bixebizujimiduj.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/sorivaromusuk.pdfIn PDF document text
    • http://ore-processing.ru/d/files/rujipusadov.pdfIn PDF document text
    • http://vitaminyplus.eu/files/file/podepivagugegivijivibi.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c24c3146920---85191669818.pdfIn PDF document text
    • http://donghocitizenchinhhang.com/uploads/userfiles/file/lazodefesix.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/tadonulitek.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160701f8e4ae68---vupetopefisagokawaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=large+printable+us+map+pdfPDF 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_off0000d884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD884 16972 bytes
SHA-256: 60892d5b587db9653869ba4879f4c4b51a707623841bcb39013356e8168025fa
font_01_sfnt_off0001040e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C25 10920 bytes
SHA-256: cf15500a4af852bc9100b2a6e8b0d390ab098330b55e03d69c6a3baaf222fbc1

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