Malicious PDF — malware analysis report

Static analysis result for SHA-256 5afb0729d61292d7…

MALICIOUS

PDF

90.6 KB Created: 2021-06-29 20:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 79870aa6917ac40d159656dbd8fdd34b SHA-1: 36ffcd9ef7daac4a5cf2ac4463a45d0647be8418 SHA-256: 5afb0729d61292d76c1b1e1c8df8d0fb485d93f0435c19950a3f4fd51a825eb3
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a campaign to distribute malicious content or redirect users to exploit kits. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da00742a931---99506705316.pdf In PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/dc355e593f5f3b5876c9baae230eca63/vepilijoga.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/96058057505.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607592222a886---78136989370.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/399e265b9e9d11b2afc0b34f34a602e2/44230814323.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/32365390360.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/b95e49353e833b3253c87b985849831c/75728597934.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/eb5ec801cd4b569f0c7938c90f7e15ea/jolux.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdb66cdd6f---21247557920.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/65758270303.pdfIn PDF document text
    • https://inifd.london/uploads/file/suparipar.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/kapukegejaminu.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/dozegunumelodabaj.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/derazixipazewa.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/13284646205.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/af8a6fb7dcb93fa101e909f8d14e9e68/gobepupe.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/f18c5a8264e2fbfdc1753e0110fa73b4/xezabivewivubobe.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072a00e2299c---tosegemiwugolinux.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/lngsahfhbf64eosk1he7psfcn1/9159529844.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae90b14874---lenenufizalapi.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be1c05b71f---69853550021.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160845fbe16133---xiloviwukamarul.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/f8d0adacf4af34e25877e01964d8e780/56859739777.pdfIn PDF document text
    • https://agatanorek.com/files/file/turelixisefoxusabup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=u2+all+i+want+is+you+guitar+chordsPDF 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_off0000fce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE1 17988 bytes
SHA-256: 46485c6fa44ce21b2d23e59782e283d08ca23b01eafbd114e29a54002d6fedc5
font_01_sfnt_off00012bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143EC 10944 bytes
SHA-256: 0bf5760790965588e6e94c4efe22493a6fa2efa94fb6b75ade2b0b3a3b6a2936

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