Malicious PDF — malware analysis report

Static analysis result for SHA-256 d634ce479c5a5340…

MALICIOUS

PDF

84.1 KB Created: 2021-06-25 17:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fef814fbf8f3dfe12b1ce5360183eaca SHA-1: 693e2c7a779d81278f659b27dfbb81dbf774623b SHA-256: d634ce479c5a534032dd20ce5b67c77205a2aeeae9be4df4930ac76b3fbb13ef
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised CMS upload directories and disposable domains. These links likely serve as lures for phishing or SEO poisoning attacks, aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/7d211ce539937b9462e58c71b6c481c8/89826447826.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/6d00102a2cc6dbbaabb6a56ec328e6a8/68732341147.pdf
    • http://fitviewer.de/files/file/39437044373.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a37726af96b---virajepijidalo.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/82835799825b22794ed3f73b0e6dcc95/44962256014.pdf
    • http://csc0351.com/userfiles/file/20210622182727_j1cx75.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa24a89ae4---81773287670.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1e11cfcc5---11534827213.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/0cdf94a5c9896c500932aa142adfb340/futuvuzij.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160783f679d446---96889529205.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/7dba12b8a909883740365680ebb36fcf/getofajekupiladivoluwefo.pdf
    • http://cdn.eagle.mn/uploads/userfiles/files/33865708114.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f122fb7193---73582289917.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20b127dc7d---28589576270.pdf
    • https://beautyyaurient.com/editor_upload/file/zopumavorumitegajemigi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a29dc81400---jedasuna.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e6fe4e689---rukogakujuxata.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66e4260cc4---19656081334.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607542c50e329---92305210972.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b1ffa9cd5---vikop.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05c6887ec6---85307207595.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/7481ade63d28cf8509c752dd338691fe/82789042074.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160acaad73b3de---puvixubig.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=sickle+cell+anemia+due+to
    • 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_off0000ea4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4A 16792 bytes
font_01_sfnt_off0001025c.bin
cadebc1b5a10413c10dd9a7a91f58ee5446590ea82897e071eb738bb411c6b42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1025C 16012 bytes
font_02_sfnt_off00012ba4.bin
0e346dcde8800c72b520ab6b23e2856e0e93cecdf0973dbdea4482759594c065		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA4 10528 bytes

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