Malicious PDF — malware analysis report

Static analysis result for SHA-256 c449d8ce043faa5c…

MALICIOUS

PDF

95.8 KB Created: 2021-06-25 13:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 977703dbf3c0a006ae2e20363b543350 SHA-1: 98bbe1c6a341af33d39ed792cb53fe39b3879aa3 SHA-256: c449d8ce043faa5cbe00cfafcf87c2d647d0680b5a54c8fe2fcbb27204d2efa2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. This script likely redirects the user to external URLs, as indicated by the numerous PDF_URI and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly support the malicious nature of this file, pointing towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://accessprecision.com/userfiles/file/tivikibedefejejupavuw.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/c6b1d2d2df5f32df57ba0a606ce3f963/xuxajeduvodexatibomakon.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccfb71a7d6---16834838042.pdf
    • http://star-transform-moscow.ru/uimg/files/51628423102.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c33138e77a399ceaf07ea93e7d1d5b98/piwadurifarukusamuzod.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/onhup6imstbs962gujer471qm3/14270633390.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160ae51165f270---27999240381.pdf
    • http://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/fedbbfbfae0f57df4b74762a809e8df8/tofifezopisakutabek.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/cfff659ef128f4742f696e32491dccfc/21262593117.pdf
    • http://kencert.vn/uploads/image/files/vefiwiridaxorin.pdf
    • http://artecgroupservices.com/imagenes/file/kugikevipowafagazejap.pdf
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/vejajefosodepajofugus.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080cabba1a4c---7097940068.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/02bb25012c1faaa17b66ff544d466d0a/63232901094.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=identifying+adverbs+and+adjectives
    • 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_off00011382.bin
6a11cf58a93996b52bd5a54e4ac8f004ac68afcd1c03c6fe7618ba1540bac357		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11382 10888 bytes
font_01_sfnt_off00012c9e.bin
afd3f6ecdd8ab4809dcc7566b8e18ff4c1838271d1113d4b0912f485f917f92e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9E 17608 bytes
font_02_sfnt_off00015a62.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A62 16792 bytes

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