Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d53e5aa5a8b517…

MALICIOUS

PDF

73.5 KB Created: 2021-09-20 13:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8c36ba2959c6772e5612abc2db832b2b SHA-1: 63fa633c0e379d604bb2fcde0e5f55ca077be544 SHA-256: 38d53e5aa5a8b517853a0377d6845ae747791219650978aeed923681c13aa70c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicative of a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely used as a phishing or SEO spam distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://archism.ru/uplcv?utm_term=sony+bravia+screen+mirroring+android+app PDF link annotation
    • http://smwiarus.pl/ckfinder/userfiles/files/xumarevonoso.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/79700368755.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/13690109177.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/zaxoseketovan.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/96350727968.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/89771354122.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161361bc0d7b2d---wepajaxokivomerofasado.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613448ec228b8---zunuvipize.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/jesikap.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/20367021198.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/lurevof.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bis20t7cv2tfte3jgp5rndf2o2/69916930988.pdfIn PDF document text
    • http://relindalouisylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94121997953.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/suketiwekusupoxe.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/lodubodovotureg.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/tesulaf.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/57474023441.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/kobit.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/silomin.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/39580464290.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/bikiz.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/xogisinijedizowazidomi.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/kesusewajeginajurazidu.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/10290662115.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_off0000bbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB8 11108 bytes
SHA-256: 4f7962d1f53b1f43f088f51c153c738f6f6aaff388d1a2450a6c046a7c393dd5
font_01_sfnt_off0000d53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 16644 bytes
SHA-256: 7098d52306b9a7a1bc6650efd84471459f04f93aa66628e612ce41ee4c2bed71

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