Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5ce7afa0da3b8f…

MALICIOUS

PDF

91.6 KB Created: 2021-08-09 08:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b3f9993488b07e461cb0e8f1cdd2dd14 SHA-1: c8bd68a47c6239ddd5fd504a71e35146dc0e7529 SHA-256: 1e5ce7afa0da3b8fefb2d7cb7c93c48fa2b811898a5ecd8e428803e76f5bd279
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, detecting it as a phishing trojan. It contains numerous embedded URLs that form a link farm, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious or phishing content. The PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=plano+de+aula+sobre+cinetica+quimica PDF link annotation
    • http://beta-rc.com/upload/files/bolunevuzojuwaroxojipaf.pdfIn PDF document text
    • https://rintrans.com/files/foxuxuxorazaranalaxus.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/50118558542.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/85031652517.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/fawubite.pdfIn PDF document text
    • http://kustari.net/userfiles/file/pesojetawo.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/regedifikog.pdfIn PDF document text
    • http://ty-int.com/files/files/50370213462.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/23531339150.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/bimatalarugasibat.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/7148a2b880542ae4db19480615b654cf/86946338874.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/82213007495.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a9bade6b378c221063e340a7be98d505/telet.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/dizesupakixakafifokolara.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/sidokilozexenabapotuto.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/66972215447.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/78055243385.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/79vkn0m5vuprr8514empjentd4/gukanekumanejuritukaputaj.pdfIn PDF document text
    • https://faprosid.com/file/31783932916.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86490ec237---22806867919.pdfIn PDF document text
    • https://2acontractor.it/images/file/16303550318.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed57f3d6e0---foxalet.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/38235956337.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/544e61a71f4023d76cdd6269c9830a7e/32302928026.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_off0000fb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2C 10920 bytes
SHA-256: 3db3ba655c2b3f6c0697c70df78ffd0b34810b1843cc104cafa50f77aa41db60
font_01_sfnt_off0001143e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C50 20064 bytes
SHA-256: 623d15464d56db16b48ed8e64e1f87817881877fa5836e80e01eb32a32f48a33

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