Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe4adc479840b10…

MALICIOUS

PDF

68.0 KB Created: 2021-09-04 04:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 0d905ff7c21db62efae78d766f1e5a96 SHA-1: fa92eaf53e4b84c500ee0df5a71ea6e969ac18cc SHA-256: efe4adc479840b10723ab1e35235e971efc3a33701c15bb9b1cbdd00d52aa3bc
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The 'PDF_IMAGE_LURE' heuristic suggests it's designed as a screenshot to trick users into clicking. Although no scripts were explicitly extracted, the nature of the links and the ML classification strongly suggest malicious intent, likely leading to a second-stage download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://cuacuonductudong.com/upload/files/84784650444.pdf In PDF document text
    • https://laserbeautymachine.net/d/files/zovebuvijipejoro.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16125de7c4a8cf---fixizo.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/67663471499.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703d9cee718---35509354139.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/todifutadugufavak.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/99525002588.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/vexelagaporagig.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730b674ea29---likitixipidebiwupok.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc8a56958df---71193273364.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607362014766a---16695865618.pdfIn PDF document text
    • http://markone-tools.com/upload/files/25127030123.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/1b8435ebe37c1742d15d23d415e0b062/gijunodamituwukama.pdfIn PDF document text
    • http://elpijisystem.com/file/54303732005.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/xewobojijujalam.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/tukupamoludoxuxuzituv.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/405bea979307146dd7372378a41b013e/18338740932.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/96584299346.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/g8alt02rk022bhg7sc09d4har5/luzemujimofejizoxujo.pdfIn PDF document text
    • https://slide-bearing.com/d/files/zawesajiso.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/sab75f8ocj267djm6vrhmvfr83/tobozigozogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=mathematics+for+economic+pdfPDF 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_off0000af6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6F 10832 bytes
SHA-256: c4eff995808a47cbc9352d49ba0f716670fc0d7648e32e2166f06a32f02f2538
font_01_sfnt_off0000c83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83A 14048 bytes
SHA-256: e535edcadd527ca2045aa96a150a2ae3122726044970b4e2f46103d4241c77f6
font_02_sfnt_off0000eadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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