Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92fbcc4a2913402…

MALICIOUS

PDF

86.3 KB Created: 2021-06-25 15:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb9ff7c630fa2c30e12c41771e019478 SHA-1: 52933fc010103c9330e0a1f4abcbf45b0cfc3cc9 SHA-256: c92fbcc4a29134024924c09c9ced258da7b7ebf4d026bee45253da522795bdb0
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading a malicious file. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan delivery mechanism. The presence of multiple distinct hosts hosting PDF files suggests a coordinated effort to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b340659c0c7---zapipuvedegef.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/a4d4bd9b0a8099349d74355f6723e9a6/49313705537.pdf
    • https://memoservicesrl.it/file/97188186733.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/8906a28c688459fcacba70bb2ba40257/fupokasupozelade.pdf
    • https://daaeportrett.no/upload/file/tipulakuxumijur.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75ad374a0c---fobipirepolem.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/835f92fb421545d28bb6a5ef1e75b8a9/vunuxizevisarumewujisewu.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf01db726a7---87151317450.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d32da495d2---69578727610.pdf
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/remoluvikisos.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9f4e0e8009b8398a44ddcf6ad265e805/rifajivekisafaburokox.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607482c8cbd18---mitemogu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=sample+paper+science+class+10+2021+solutions
    • 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_off0000ec75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC75 16792 bytes
font_01_sfnt_off0001048c.bin
80e7847b01dc7f9655387731350f27fcc24fa3acb766e821fecb0b0741124d27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1048C 11004 bytes
font_02_sfnt_off00011e22.bin
4cb008fdf655cdbd96c708df2ddda4ba9102a8eef960bf5221a6c78aa7a8b5e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E22 17544 bytes

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