Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc573be7fb15dba…

MALICIOUS

PDF

90.4 KB Created: 2021-07-05 02:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2426ae91db8fbd7fc9ce4a63619b82b SHA-1: 8980c149d70c324cc81edb8433069ac142541f81 SHA-256: cfc573be7fb15dba9a112dac1fb88809583f61fd513cb5b3b47b7ad950b58c0a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160abf23322814---titoxoravuzigaman.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc73350ac9---15333217094.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8fd713533---wupef.pdf
    • http://ettorebelfioreliutaio.it/userfiles/files/davokuvovitaguwulom.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a41dce97---49732327573.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/a1cb3a77cb02f0ab9144dc3cdb62599e/31601182287.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/es53tqha3cgenfn262can0ls65/gijewabarixojififobumu.pdf
    • http://vladjurnalist.ru/archive/file/mezufixufovugesexevidot.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/74ckaeb6ama8i50ia96jtpk6en/37930175733.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/27bttj66naat92i0of6s2a3l91/pirurepereba.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa10b09c98---95473219880.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a11f174c5---woxumoponoxasus.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/8rt99dh6tc6p0phbvohcgdnn4m/gepobuzegawekebilatijaxij.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a5659bf4e---kebazuvajolirorixo.pdf
    • http://palyavalaszto.hu/teszt/upload/file/vuzirubemaxuraxufimuze.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/mr6hr5spd0qie7sea6235k82gv/11077794559.pdf
    • http://grupopiscis.com/upload/files/93254717481.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/c82a6dd0a80785da5e2ca86405e65d12/wusazadevojedeso.pdf
    • http://tatishev.ru/admin/ckfinder/userfiles/files/41792726279.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf6f9a47575---sojuxunibutaxuxipo.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c14448a7eb1---65960417581.pdf
    • https://mecaniquekd.ca/upload/file/xarefafojabinomobad.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9ef4c58f8---48168049231.pdf
    • http://kamnitikamini.si/upload/files/dotidimanenuzuzaxomoli.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=kings+and+queens+of+today
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607282948f13f---tudoduxif.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5f1.bin
c5b4eabc26d4e59eeb334bfc113e70718c85c7143234ac9ddae9f0d0a0a9a005		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F1 16860 bytes
font_01_sfnt_off00012168.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12168 16792 bytes
font_02_sfnt_off00013975.bin
21942acb00b1b514ad7f6c1de23740500cf86f1f6083a7317ef64fa8985817cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13975 2296 bytes
font_03_sfnt_off000143b7.bin
10065213b214ac3928c7841b826f32735750e9f4f77a6e2907df977a8fc99f85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143B7 10736 bytes

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