Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b351c7430c6504…

MALICIOUS

PDF

80.2 KB Created: 2021-09-22 20:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eb7f677a385062ba897d213bceb28fa1 SHA-1: 28b3ed596c016c23b00197dc85bc188d77a1b3a4 SHA-256: a0b351c7430c6504c85f47f37e34f37b1e468b623c90a5098fdfb002aacddb71
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites. The presence of external URI links and link farm heuristics strongly supports a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=top+free+android+video+editor PDF link annotation
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/pekugunewekopovom.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210902063350.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/15878732025.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109071124349466.pdfIn PDF document text
    • http://vodova51-53.cz/files/zepaxojuzisexijowepuropa.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/gunozezobe.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/rigaresaxojizaziv.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/velawisemomesemafijafipu.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/23655169576.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f588d7746---30895764067.pdfIn PDF document text
    • http://metabolit.ru/files/file/10491792886.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161317c199242d---larudurofod.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/putofitabu.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/74807442341.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/nerozu.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/d0903f9437152306b650a5a235fdeaf4/bunolufevelamakapor.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/lolebuladumoximarawaw.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614984a997730---domexegezuduv.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/53614119036.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/mabosejesolali.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210918021209_jvpc02.pdfIn PDF document text
    • http://gptools.net/userfiles/file/99740932817.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/64599711774.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/dibujiniziniri.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_off0000d925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD925 16632 bytes
SHA-256: 054571ffd6775f1f71699e18dd373e53c5e6951e1855a9a10dda39ebbd0aa800
font_01_sfnt_off0001037e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037E 10308 bytes
SHA-256: c7efdbae9fe037b0a81939d6607f83c2467567d7a1fa9eb283b52aecf5c84565
font_02_sfnt_off00011ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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