Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e2e5b8503b640df…

MALICIOUS

PDF

86.6 KB Created: 2021-09-02 02:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f9f78373cb2593e71afc7dbe34eacff5 SHA-1: 24e19f2006a60846241363b9b57d9cebbc8153d1 SHA-256: 5e2e5b8503b640dff1681aff6df3432e151a8ff6ac48fc7b29ef1a2ebd24a22c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or link farms. These links likely serve to redirect users to malicious content or download further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cottonweb.net/userfiles/file/talefuxutiwuzepunape.pdf In PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16126f1f430c90---nutananozuzesago.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a101cd4a555---69287148974.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/gewekaxuke.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/8d9e64fc11284fdf8c811992c7b10cbd/vemusijuxajuge.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/872e276b0cd4c8ebaba6fde9bcfb2833/83845594689.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/5dpficp224k30gmcalmmqf1vd7/36395810498.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/8317385231.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/jomukakemigefelu.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609989a489b6d---kiforoluxasazevuro.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/210913531962f3ca04fb6381d2eaaf2b/gowupuvozez.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/65863473904.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/9mskmpqkcdqpmtaaa9unr3saf1/misenarenudexibipeli.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/nulopowixipexujewujil.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/pifuxeviwasexe.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/lakigimabafevilo.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/1d81deefcb5ce99de86936c80c5c726b/dibopapuk.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c641df223a8---semajafexijamexuf.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e181c5243---43158868520.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021071005530010.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/23251139255.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d15242dc62---19700542218.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/ea1af7957b815a5ac85debda6929c311/jojojunonagukuredasivelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=highway+traffic+act+offencesPDF link annotation
    • 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_off0000ee3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3F 17856 bytes
SHA-256: 22bc34561f02f5317588ee8ebcf281f8aa280870c561f609a84a13fc6bd5578b
font_01_sfnt_off00011bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC9 10760 bytes
SHA-256: ff9b96d88cc26132b4ca8deacbb168270bf3a4afc8af70a22a9b36a696f4511c
font_02_sfnt_off00013493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13493 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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