Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d3df56d631c664e…

MALICIOUS

PDF

97.8 KB Created: 2021-08-11 09:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dfb0279037a0001106b8c5609fd2eedb SHA-1: b163c40e32064676de980c150347bf69a1ec5935 SHA-256: 2d3df56d631c664e95629cac1d6cc350b67bf26dadae43ff467255c9d5a7e28c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URLs point to a common tactic of using link farms for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://wastran.ru/uplcv?utm_term=how+to+operate+a+jenn+air+oven PDF link annotation
    • http://narcisse.sk/editor_uploads/files/29058178732.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/dbbvceggkoukmffn64sb41prc6/69808607299.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/79901790658.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/58462919531.pdfIn PDF document text
    • https://digireg.it/upload/18074527194.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/madoluvagaju.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/0631aec82a2ebb48064ac479b34dff2d/zokiguzavigazikibanilugik.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/rs782tahe7mgcfpi75suqtoim4/desawolituwodive.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/37708768918.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1628340854.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/nazotebuwujikesurej.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/12805902860.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c19d0adc096---surefevusekelegagulasun.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/koreniwiwiwed.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/74751251447.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/89a259fd7165d7099ee524a6067c23ff/19555979367.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/305rkrrb6rqs62o6u2ojfv8tt3/xajibexuzugafawogafito.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/kes2m7r9oadalgub6pjbrvbta4/23046422908.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9038cf0113---mukutadosi.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610ad18287066---vapapadi.pdfIn PDF document text
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/bugejux.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C32 17320 bytes
SHA-256: 73f235686b395d363ea77a8d6a83034165616225e9163495bc4328e0afc92491
font_01_sfnt_off0001495c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1495C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16173 10304 bytes
SHA-256: 2838c24ec64b5fe400bae471e605a1889871db34f8c0abbc11a9b3216591b349

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