Malicious PDF — malware analysis report

Static analysis result for SHA-256 e565af675f75351c…

MALICIOUS

PDF

94.5 KB Created: 2021-09-14 02:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b358caaa5677714454c7c61c6b22ba1d SHA-1: f0430d8245fdd9c973bcde1d0dbaa0102059e5f6 SHA-256: e565af675f75351cbd7c3e14d9f871e5d33d846eb85732205bc6c5b86102ed8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised CMS uploads or hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://domkomplekt34.ru/attachments/file/tujiruxugixotidamapa.pdf In PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/c26728345031fbee433ee6138796456c/35863748877.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358603ce4ce---sawudofeweposawiwu.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/xujumo.pdfIn PDF document text
    • http://raczcsalad.hu/files/gixapogawilipezikobuwa.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/17888506382.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/76927730647.pdfIn PDF document text
    • http://vladekoservis.ru/files/1922299384.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/70820052372.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/d5ec24c6e980509dd540b19c75721d54/xilobonibovetivinibapaw.pdfIn PDF document text
    • http://mq-water.net/upload/87363541750.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/8487140897.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/dakinuligaga.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/3062528335.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/nunozesugekamodilub.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/83616843273.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612e990cd0170---rofasetewudejesow.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/dugovawigedelolelaxukaku.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/72433519080.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/97818081284.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/49i12rucupjsv0tvlr9v0vodq0/naxekupobizaxufag.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/51538310310.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/130946525502.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/zimazana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=one+flew+over+the+cuckoo%27s+nest+pdfPDF 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_off0001080f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080F 10868 bytes
SHA-256: bbfcf17abaa02729779e9952564c8deee3e33b4d24a00e6082ab4f7a3440bed8
font_01_sfnt_off0001214e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214E 19508 bytes
SHA-256: 4bdcad916cf0085d3af8cd84ac7dc3a7193a7b682fc2aef034126f426c676a04
font_02_sfnt_off0001543f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1543F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1