Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac56a25a409231c…

MALICIOUS

PDF

139.7 KB Created: 2021-07-05 20:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 807c5e23882f8e14ae19288628e652df SHA-1: 472b217eece2cb7b4c0c86ccfaab47c2c3becac1 SHA-256: eac56a25a409231c2ba82c7bd45d1c7538b9aabead12b7c600fee563540a48a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting an intent to redirect users to malicious content or phishing pages. The presence of multiple compromised CMS upload links and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16080e084b55c1---337489247.pdf In PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dc2714e4b---modumibisezilunem.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/67178947500.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210613031721539.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/livexetasikugabixipuma.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/73493038613.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/39239525958.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/27671683940.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607732378728d---fosedusinegisogeke.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4d955b1e9---surusefofipanile.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/381243e3ee69ec56a15312f64365a7c3/56824208792.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/xofigokilibaxulumojoviz.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/bemibixadifajagebigu.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7dcf10d32---gozezulogesotof.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/lirofajovu.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/fatif.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160aed17cdfecd---23046529112.pdfIn PDF document text
    • https://areicon.com/images/file/72316356580.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d51ee999510b9290b2d8e098feae2bd/52124287168.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/wexijot.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210505212124184897109.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/vipogiwodepedurenodewijaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=demolished+meaning+in+tamilPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCD2 10596 bytes
SHA-256: 1817adce3d13bd3c521124fe9643a60f1e6f94c63e2e65cf9cc67255e31f352b
font_01_sfnt_off0001d49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D49D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ECAF 20468 bytes
SHA-256: 27f420f2e42a5db87d97f0b144e196b6cb305d84e23620e3c4d799d8339b65fb

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