Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4c11eb7fdaa7b3…

MALICIOUS

PDF

81.1 KB Created: 2021-09-11 08:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2b9113d36398b9965e0ea440cb1449d1 SHA-1: bdb38e38124a227e7b2f5a6f6bfcaeaa3a55ef59 SHA-256: 8e4c11eb7fdaa7b3e1220e219ef4844ab2df7e50e3cb23ca44862a6ea3c5a202
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It functions as a link farm, directing users to various websites, including those hosted on compromised CMS platforms. The embedded links suggest an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=descriptive+words+beginning+with+b PDF link annotation
    • https://pankajplast.com/ckfinder/userfiles/files/49254867245.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/fatoka.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/83858440358.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/83862888176.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/92516890353.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/fomekevapanimuvumunibid.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210903_041458.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/6085d0e51a2ba8e46138b6c41d8d637e/lopub.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/suxajolutulugizatukes.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/47137665050.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/10886500355.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/80488827221.pdfIn PDF document text
    • http://coachhouse.info/assets/file/nukejovafunidonobuwog.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/47030772569.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/xikenuke.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/84130759810.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/54143842273.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/37370874040.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/49989364615.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2d26537d4146e409b54581af02224e83/kulefovuritesigugijupido.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/28310882779.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/83758192477.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/47216309785.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210906202152.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f19c86df7f---65827950760.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_off0000dae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE8 16728 bytes
SHA-256: 98a8504f0d9d11e41a4d2afd8b68d14c2de3e109b75a1c427e4d1bea524b368d
font_01_sfnt_off000105d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D2 10880 bytes
SHA-256: b6ec2bd3e2fdcd0a63dc555e85a1f666a14833521a8879844baebb0bdf91986e
font_02_sfnt_off00011e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1