Malicious PDF — malware analysis report

Static analysis result for SHA-256 a879d9ac5d1de276…

MALICIOUS

PDF

86.9 KB Created: 2021-08-10 22:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3ad31e18dc1da945a89e5e4e414e28d6 SHA-1: c21ceaa85545143ea4dfff45bada78cbbd82b2fb SHA-256: a879d9ac5d1de27625545bb9706fe71390943bca6319f208aeeedf505cf91697
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of a link farm pointing to compromised WordPress uploads and other disposable hosting suggests a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://banghenails.com/upload/file/tesefibesetuzof.pdf In PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/70644244743.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d4949a8a6---jetewanaboni.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cf3c5b565---rinamod.pdfIn PDF document text
    • http://edgecs.net/documents/papobezajazanixojaluler.pdfIn PDF document text
    • http://ktcz.eu/files/files/56798290009.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/75162156060.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/bcnnhotgsduv7jcrsm87f564bs/vugofinisavukisuron.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/gugamexowuzemazobu.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/10274e6a62e43026786e62ed32254d36/datuzikabiwon.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/rejudebobonizaped.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d302254a738---65526248249.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/ludetorogukadufijanuzowi.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/bu8089jrpnpl9q7hgqeocr4k7u/21741559202.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/vq5eq1h10slbkb2r0eo19sqoin/kotixisuverebexibez.pdfIn PDF document text
    • https://bestwaynepaltrek.com/ckfinder/userfiles/files/68701180121.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/kederusovelewuremoke.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/55633743325.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/33f5a48763de8e535d2d28e51eddf59a/12591396499.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/89422245477.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/0eef7974f5e400e517d95b941b463d93/xawemefaf.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210529154213083.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/f704d4d7ba57f42cf2624def5be4186d/21343745661.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210703163622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=auguries+of+innocence+summaryPDF 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_off0000f065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 10732 bytes
SHA-256: eb668e80b43593472d6206a62280652ffbd696be6a98d2b70508a0160a17a6a1
font_01_sfnt_off00010916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10916 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12128 17048 bytes
SHA-256: 5d3c438bb8636b53ea04fa5797dc11af3101ae6acf1905549cc3fe21b08ff8a4

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