Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65630c09c75c1c9…

MALICIOUS

PDF

68.9 KB Created: 2021-09-27 06:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 51ffb3f1dc9d7cbb3b8be46fafe30a4b SHA-1: cb53469a8c1ea9114b9a26857b15fe7a3442546f SHA-256: b65630c09c75c1c9044649c7f24a574cbeb8988b2522158e6b42b88fb0915a65
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing lure, employing an image-only design with a clickable action to redirect users to external URLs. It contains embedded JavaScript, which is often used to facilitate malicious redirects or exploit vulnerabilities. The presence of multiple links pointing to compromised CMS upload storage and disposable hosting further supports a malicious intent, likely for distributing further payloads or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16137761f50ef9---15645074786.pdf In PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/nunulituxipudopakuw.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/2523095692.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/73693706412.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/wimej.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/974ed6c4b8d1c075b540acdadc66195b/36737150564.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/lujokinizizejejogamidise.pdfIn PDF document text
    • https://cecprint.com/images/file/91806476038.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/mikegabopedu.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3b9ae45a0---21252111079.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210927_1C3BA6AC91337F97.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/zekebipuv.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/a9cde80736cb9edfae9f190872674261/46022862876.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/mapafurimazomobenarujoziz.pdfIn PDF document text
    • http://bienbao.net/uploads/files/17769358853.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/xufanofisegiladewef.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/90107561937.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/pemibeninimewawilemefew.pdfIn PDF document text
    • http://www.moyekolodin.com/files/1718658281.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/vunaxodes.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/17419228482.pdfIn PDF document text
    • https://superchills.com/userfiles/file/36181607835.pdfIn PDF document text
    • http://effekt-film.de/files/file/24072088026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=search+engine+keyword+rank+checkerPDF 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_off0000b0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CE 14044 bytes
SHA-256: b18aee82beb36d9edb365a6e26db005f1af82eb5ee2c5a61b932a610cc7710d4
font_01_sfnt_off0000d3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B5 10704 bytes
SHA-256: c67d3778a62f1c8a940796fedf81b6628835c195fa5ac528e770ba232c647fb0
font_02_sfnt_off0000ec16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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