Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98c1405cf81eda1…

MALICIOUS

PDF

90.3 KB Created: 2021-08-10 06:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7c63b8ccd894d35458832c4bc3bff2b2 SHA-1: 444ac3ac4dd3071c0cf088ee1fcce427ea4cd0be SHA-256: d98c1405cf81eda14f18d5968a1fcf2b9bd426608d3e1156b62179c827f73081
172 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and numerous links pointing to compromised websites, many of which host PDF files within WordPress plugin directories. The presence of a 'download button' heuristic and the URL structure suggest a phishing or malware distribution attempt, likely masquerading as a movie download to entice users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16083a31d3d394---rebinode.pdf In PDF document text
    • http://www.awakohchang.com/image/upload/File/6485543737.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/sefuxejudixirebuwazuza.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd3f127c8c7---wikopizirijoxetinarig.pdfIn PDF document text
    • http://unsersohn.ch/images/file/20879679873.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d468e88cf---wevejebopa.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/21980801502.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c66d95f9c9---66064842925.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/turaboxunen.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a96b8a020---14476935315.pdfIn PDF document text
    • https://tdfstore.it/file/dorumazilatove.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adb00b17620---xuzipifanelumumubid.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/4296597627.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610b13c72e065---sewogox.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6427de58bc002954a8ff2c7c28d82db7/94796074736.pdfIn PDF document text
    • http://www.uniformsolutionsforyou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606db2c5026bb---43137627867.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/79229568354.pdfIn PDF document text
    • http://flomojapan.com/upload/files/lamilazogofumelel.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/zukivozuxudujebenasifoxob.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/29181353034.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/pawojokakitawer.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/dofuwekevokoti.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a948e2d20f3c65f0525340366078a8b6/80067432022.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/foriwetuguwuwobadiso.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/a0hn4dkjg0eslerjrmoi72umvk/pavafodurenuzoxogefena.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/92005721715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=commando+2+movie+download+720p+filmywapPDF 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_off0000fdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB0 10880 bytes
SHA-256: 10d4cd55446ac8351fec08279aea42ea01d0d511f9d62341357e92a90cca760c
font_01_sfnt_off000116f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F4 17024 bytes
SHA-256: 6cb36730f3475260228aadf015f07336bf65c68f735a35c1a970de65d3a22409
font_02_sfnt_off00014334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14334 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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