Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ec09e11fe0a3fe…

MALICIOUS

PDF

77.6 KB Created: 2021-07-25 05:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: fdb594af2d196fa026a8ef6f38ba4490 SHA-1: e358856f5ad5f6317ccb671887eaeb37b3b27a5e SHA-256: b0ec09e11fe0a3fe10d95a84faf0b3e758449f843a2640d6dbb8656f3aef9d8b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple PDF link farm heuristics reinforces the assessment of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ccaquebec.com/userupload/files/mefejitimererabuf.pdf In PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/75688598040.pdfIn PDF document text
    • http://htcable.cn/d/files/64164272188.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/c48c0a7d55e353ddf7cd00dd5ded5aa8/rukipim.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/84104474626.pdfIn PDF document text
    • http://ahchala.com/img/file/10023827893.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/naxoruje.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/nejexazuxebimazisuzofom.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccfacc7ee3---zulumobadudenewunep.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/nonovijowuvozokiwi.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/097920211ba35dbefe31fa8b488e2736/15769937353.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/df7a82e6299d7a003469d945054ae15b/pedapokewidegin.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kexotofava.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/n855tmft4kq8b846qh4bjrg2tv/mosasudame.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/f9dd0a9ea69e71e579c553c69d74e8d7/16057008582.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/ruwagekirajofumipuzon.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58dd00c090---wifuxewibajevevogije.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/98550442357.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/houhbimb8deiqvmjiu9ioe5ecl/76015044190.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/mimiminolumizuwuxikobatir.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/26515906415.pdfIn PDF document text
    • https://jin-ji.com/upload/files/18102800185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=architectural+drawing+rendow+yee+pdf+downloadPDF 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_off0000cbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E5 11012 bytes
SHA-256: 4f71fc7ccf310c95f9d9ce4ea8012d9c8a6fe47b3d3277e836ccf5a61afe0443
font_02_sfnt_off0000fd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4B 16444 bytes
SHA-256: f83d33fc55fb644850d2d68e0254265284c9c3e5a34309721ac12f4dd67e606b

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