Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd65cad4ffc51583…

MALICIOUS

PDF

71.0 KB Created: 2021-10-04 00:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 36e87a0b02b78de21ab5c7b7cddbdc51 SHA-1: 167256139fcf7707e2adccc1f7021a96f9ac0cee SHA-256: dd65cad4ffc515833bb58efac1b64d282107d467c3b63884ecfc0b592ea4a1e5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with critical heuristic firings indicating it's a phishing trojan. It contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure and link farm characteristics strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 7

  • 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.
  • 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://fundoohairstyles.com/hairstyler/images/file/wajuzu.pdf In PDF document text
    • http://castudio.eu/userfiles/files/34471778441.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/91628858832.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/bivorudawo.pdfIn PDF document text
    • http://balone.net/_upload/file///9038584243.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/madenasumekabesex.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614422284a39a---foxuxikomokezoteja.pdfIn PDF document text
    • https://33mobility.net/uploads/files/26182781825.pdfIn PDF document text
    • https://atrax.hr/files/zuxid.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/8203772364.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bcbeccde35---xudepitose.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/zuxakanagexivejup.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/9906d82ceff7385337e3481e10b2ad79/32445358992.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/rigereraruzunuzona.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/92872615712.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/72712781244.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/rotifinekewuliwuraxasoki.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/u5gmdscntjj21dagiov8fa68b0/bejinedovanipalekudutujus.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146675a0d96a---rajiwesasete.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/13823496246.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614b25cc509bc---kivir.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/26730217182.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/nazud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=design+thinking+value+proposition+canvasPDF 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_off0000b109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB109 16460 bytes
SHA-256: ec2b559a3dcd4b9ea9ff0a084ff523e5490bac6b01294f8b064b35548371012b
font_01_sfnt_off0000db15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB15 10912 bytes
SHA-256: 5441e5bae7558bdd1da2e85d54d155eb322e330c1bd54e7b0cd61554f0d5ce23
font_02_sfnt_off0000f460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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