Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a3abe74ab04b3c…

MALICIOUS

PDF

83.6 KB Created: 2021-09-04 07:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2ab9754cb942cf805b30d09d429de84f SHA-1: c4b0bd41830f2a2d51f52edceefbf1719640315d SHA-256: 83a3abe74ab04b3c8044b0546676512e29a3f99476369bd4dd92da7323f784af
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to redirect users to malicious content or download further payloads. The presence of an IP address literal in a URI further increases suspicion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fc11bee8e---31281966524.pdf In PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/64p4f7o73hri9e3kfbidfllk6k/vunomojetoletax.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf46704baa0---rogilexubu.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/dewupe.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/firiwule.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/zapov.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/62312519228.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/36dfd9d35714f2d6d5cf83254ce44cb2/76283486594.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/bc8f169dc8c1e8cfb59e954cd736be20/55998809550.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d0896116db4eed90bc0723fbd7304ec1/pivadug.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/6058843040.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093b6d3d686a---werumibawunegopopo.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/regodetunujisas.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160957514d4689---disaner.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/fpva99jheud47ffdp3epjl3ju7/36440438246.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a1b1c0477---14046830077.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/60145771869.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106c11119923---tuwafoxivavenevekif.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210826_192820.pdfPDF link annotation
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/24ef0815447de9e48a551ff4f1201c7b/87949754326.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/134c0fa415fd003c6004bde9c2928825/talonakazerasezuxik.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/c003ff26521e55db13f0e01c71fe7b3d/73155161305.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b417513aae---34516723371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=livros+hernandes+dias+lopes+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_off0000dc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 20216 bytes
SHA-256: 3b85b4a41a0ac38ffdc78ba38ff6b4facecd79cc9528d2cbf0ab444b4268437f
font_02_sfnt_off00012753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12753 10520 bytes
SHA-256: 260ae83e3bcf6aa2cf22492b4c164df7e4b8c35b0aecdbcfba8b7b1a84853856

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