Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d8a1bd2a12711f…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 01:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2d4e22a7734a3d4ae313b4903e6022b2 SHA-1: 76fa9753fc0ca9120caf706496127246daaade37 SHA-256: 16d8a1bd2a12711fcfe6ab056966ac574ab699fcf04e68eb44c3b8298b2e2f8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://irlanc.ru/uplcv?utm_term=words+beginning+with+zo PDF link annotation
    • http://iweldbot.com/ckfinder/pho/files/47140224060.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/d7953ec58294980f25de4f6255594b4c/60930069402.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b1088817e52---93668031466.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/58815841146.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/65786770357.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c91b81ed02f---19843587746.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/82954553257.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/ejo70vrch4vonsteorfi479175/99845343452.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210623080407.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/12c7m1lblfm4nh3m1j007ld16d/gitanesarumoxew.pdfIn PDF document text
    • https://np21bellapalermoshopping.it/file/40376414789.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/32479802184.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/neruruwiw.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123854c0761b---30175135037.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vivelojanaked.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/37ae51267f17c8d4df20cebbc0ab9a54/beninotitemomaxibivupa.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d41e9b84---kuvoje.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/sizina.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/68384490129.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811119e2810---poded.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121678d145b3---29491656515.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fed188d5bf---patawixunedexarunewutut.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/7900135578.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/8531963466.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/35697543572.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_off0000e294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE294 10600 bytes
SHA-256: fe073d290a69b6f527466c88faa72ee7a76bddc4a38be1a326d934237a486e37
font_01_sfnt_off0000fa98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AA 17652 bytes
SHA-256: c02ad73c3dafa0ea7add4629d16baa793e5953bb01742ca271adb1fd4a7ba756

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