Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79b784822697690…

MALICIOUS

PDF

97.4 KB Created: 2021-09-09 12:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 38309d65652d990526d0f8f2018132fc SHA-1: 714509adea3628a09efa9a2d259748612635eec5 SHA-256: c79b7848226976901e14d891bc049168dd1cbe993cece3a6b142f00a5869fa97
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially compromised or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF-specific heuristics related to URI and link farms further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://nomylo.ru/uplcv?utm_term=standard+progressive+matrices+ppt PDF link annotation
    • https://jechrina.gr/FCKeditor/userimages/file/soxoloxe.pdfIn PDF document text
    • https://grandegroup.net/files/zajikalinasademis.pdfIn PDF document text
    • https://satesayap.com/contents/files/53357163806.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/89260318095.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/gosapokigajivugufuwer.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/50224861854.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/42184549767.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/67887644153.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/xevofutiworalivizunut.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/87938925848.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/jatixolatit.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613147c123166---nikobep.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161336d6e0b324---95981229914.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/76224316061.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/37432525395.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/bikaporasogiletigamawune.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/62068417955.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/tenogekinimu.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/bilirikajefisalu.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/vidojusurufunowexe.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rudinenetisokoxilevabev.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/31839650605.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gv1mufgoddi9ejt77m8o0jf580/30440173832.pdfIn PDF document text
    • http://symbolfoods.com/files/file///nafalulafo.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_off000113a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A1 10952 bytes
SHA-256: f865e8acab9a5b0771efb84d67411e2a85f285e27e1f3586e660faf87c4f4ebc
font_01_sfnt_off00012cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E0 19560 bytes
SHA-256: d890b62c8990fcd2598cfbc105296dc561ec97cdf355bc13bf943f56c7761951

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