Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ea72a0633e70b5…

MALICIOUS

PDF

75.4 KB Created: 2021-10-04 17:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1b5969530b7a3dc091afc0c08ab542c9 SHA-1: 83da810912eb3698a2568a58faf87fb06c2cf621 SHA-256: e9ea72a0633e70b583b77b3226aa1731359193d4d8586ece50c60396b1096157
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external URLs, many hosted on compromised CMS uploads or disposable hosting, suggests a link farm or phishing campaign. The ClamAV detection and ML classifier further support its malicious nature, likely acting as a downloader or redirector for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • 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://pistant.ru/uplcv?utm_term=vce+player+online+free PDF link annotation
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161516af240a46---73655032035.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/34612673131.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/m919id36oj6odrijml9044thd7/85882915421.pdfIn PDF document text
    • http://csavarkompresszor.hu/userfiles/file/57036015648.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/54035906278.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/32717276313.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/48003849738.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/81456785383.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/57643035602.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/kudukoko.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/49507315363.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/93404672493.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/fasufekituba.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/jofirufisilazubaf.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/65576039293.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/34436318423.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/kamoreforiwisuramafukiw.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210926060234.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/11908238428.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/9353222126.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/womurikevarunowug.pdfIn PDF document text
    • http://yjccnc.com/upload/files/43180628026.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/kirofeto.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/161356c34da518---78577207574.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/99662031828.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/sufutobutubonoti.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_off0000c463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 10292 bytes
SHA-256: 1355081f76a8478975caa34160431bdf8cc40393efc3705843502d5d9cac2e6c
font_02_sfnt_off0000f3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BC 17232 bytes
SHA-256: 9ef8312445847aa8ea06a74f3cc40f382ba876205700bd607011c1668c9066d9

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