Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0f2634fde12110…

MALICIOUS

PDF

99.4 KB Created: 2021-07-16 07:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d7c0a302ec35bd475e03c6a1415ab1ae SHA-1: 708007c756944feb64dca15a370d0eac4e724cec SHA-256: 3a0f2634fde12110a9bc4e26f114d4dc39d559dabe01dd10fca3541b540eec9a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple external URLs, some of which host other PDFs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure malicious activity. The presence of multiple links to potentially compromised CMS upload directories further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

Heuristics 6

  • 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.
  • 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://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/af76a73e29e01b21ebfe80581e80ac83/90363838779.pdf In PDF document text
    • https://ph2020.org/FCKeditor/file/jaginamitatagox.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2780179d52e7d236d2ffaefc350401a8/sulufirigepabet.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/63769546701.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/27827456c2bde3bf708a9ba2970abbcb/58692294424.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/64606219426.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/tuferaduninazezolokilided.pdfIn PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/terateraxixodunudoso.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e13ca6e522---rixemorovefubodolez.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/64438884342.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/2b6150759cdcd87a62f194244a166e21/wodanazijijuwuvonebiti.pdfIn PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/dozopizinenuropalekatinuw.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210518075559.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607529685cbce---dojimigubutadilaniwa.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef5a4b5e5d---gipozedabeloga.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/40417230097.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/tokuxom.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/fusesitawixogobatevogifet.pdfIn PDF document text
    • http://allasclub.com/campannas/file/13545262079.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073018876eff---satarebilomub.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/5c85f1d140cc089dbbccbfd842662e6d/lerubisodibu.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/506761f54e9cb4a8d7934fb0c5ad5833/doditeji.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/sejipilomekotem.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/baf35ad574bdbcc42fa04eca81c79f01/gagirenukedaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=easiest+language+for+arabic+speakers+to+learnPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000fc02.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFC02 17984 bytes
SHA-256: a523a7d9b816bcc7776af91a3ddbcc863ffcab7ba107aa92c7c16e91dbc5d866
font_01_sfnt_off000117f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F7 16796 bytes
SHA-256: 7bbb62f02b64dc99cd126f92b099437ba2addb03f4544302bc18ce0067ddec22
font_02_sfnt_off000143b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B7 10968 bytes
SHA-256: e344568bc53f1ff760c131914cc675487b60317f65f2920e0289d88863f7a06c
font_03_sfnt_off00015d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D0D 2168 bytes
SHA-256: d13089cb9863daef0dd229a5b8b9a2fa303b51473492a91dd27ccc67ec885909
font_04_sfnt_off000166a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.