Malicious PDF — malware analysis report

Static analysis result for SHA-256 59f7aaff5a08ae6d…

MALICIOUS

PDF

93.4 KB Created: 2021-06-27 20:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 85f57bdd908206783b7290efe869f67b SHA-1: 0c63491d12854b3bfcf9551a42463a27b25b52ad SHA-256: 59f7aaff5a08ae6da568604242c7b357703aa07c77a8d01486ff8141478470db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms points towards a spearphishing attachment as the likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://burstallconrad.com/editor_files/file/86224176536.pdf
    • http://naturallabs.fr/userfiles/file/gidunox.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/0ca1bdffff8e5485a242eafa74fbfe48/6409229103.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/03641c300fce9a4a6912c6e5d4a75169/bomubu.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8344fb8674---94259360574.pdf
    • http://anhbanglaw.com/userfiles/file/40895889281.pdf
    • https://fundreamz.com/ckfinder/userfiles/files/gisiremafefezizurokal.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bd580c01e---70958084960.pdf
    • http://alimentosldm.com/userfiles/file/talamakuzosu.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755408403d8---81849562432.pdf
    • http://aylincinarli.com/fckfiles/file/57780120188.pdf
    • https://eternalbliss.net/file/43022575517.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8c2d1855f---64990867339.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/663385261925a8ab160a1ca8a63f50f6/18304448223.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee1ab4dea2---mosopulirusabowibasu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=difference+between+atomic+number+and+atomic+weight
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/2df7d62d7751da7943fa5ac53ba7dbaa/nesidanakaxuf.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_off000107d0.bin
e10e870829875498904d6c5326a671b38ad4a7db657d36eec12a1f34638491f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 18032 bytes
font_01_sfnt_off00013750.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13750 16792 bytes
font_02_sfnt_off00014f67.bin
6bef493bd3b80574b79b1d25d649c8151ba04d53cc513f1d452d8ac338d43399		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F67 11036 bytes

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