Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cccee66ff45d711…

MALICIOUS

PDF

74.9 KB Created: 2021-06-26 00:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc0c23624f4fe3b734c94056367aaa34 SHA-1: 7340519535bb92f697c92c26adc2e33bd35a7e9b SHA-256: 3cccee66ff45d71191df9bc5d931152322ba21be60879e6031434effd27080a7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. Heuristics indicate it functions as a link farm, directing users to a compromised WordPress upload URL. The presence of multiple external URIs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://smidgel.ru/uplcv?utm_term=newton%27s+first+law+example
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62609842f2---66352091536.pdf
    • http://chupanhnoithat.vn/upload/files/68214255444.pdf
    • https://anmoul.com/userfiles/file/dozumewebusarasamifopu.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/faaab5b850c0d4c0a21cdd1a8380b429/jatekerikavagupuzuge.pdf
    • https://realschoolspirit.net/scauserfiles/files/6805791432.pdf
    • http://mea-travel.pl/userfiles/file/28327857722.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16083da6b73178---24285278507.pdf
    • http://drironcat.com/images/file/xukemesoxoz.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/61a9a98f193556917418d3b8f8db7caf/68345345103.pdf
    • http://filtrydokoparek.pl/img/all/wosogesadibofogujomel.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160905d6f9f37d---sesevovewaje.pdf
    • http://aarogyamedico.com/userfiles/file/11634538955.pdf
    • https://artlabjo.com/userfiles/file/53047534398.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f78bcdb76b---74336081793.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/v2fmgp22vjphai3q49ih5bt8m2/regetotodelidimugep.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_off0000c42f.bin
9d89b7e0cdfa68870c866b73fc1baadf0b3664d059e3855495914c33a9b198c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC42F 10720 bytes
font_01_sfnt_off0000dcf3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF3 16792 bytes
font_02_sfnt_off0000f505.bin
d5b0a3107373270f88056a76ed869186ca709ead1b6dc08486c28929ec4cf093		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF505 16208 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.