Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b9347ad50312ce…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 11:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a525965291e362e64b1c85b220eff723 SHA-1: 16da9b3728f01262dee623a5a889d4944a518f82 SHA-256: 88b9347ad50312ce851edffee90b8f30d940cebacf749eba3f02822bbcdb968a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and disposable hosting sites. The embedded URLs, such as 'https://allytemp.ru/uplcv?utm_term=ipad+apps+on+android+tablet', are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=ipad+apps+on+android+tablet PDF link annotation
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140148522eb9---56643161492.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/98405150529.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/bogeluvozojibexibatafegin.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/69354337319.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/37058149869.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/sigiwevedelemopirox.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/kakorepilinovenik.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/50911975600.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/gakofuji.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/bozaguzedemisa.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/v62bsd7b86p96bg2dm7uqfq4sm/99509684895.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/39189200986.pdfIn PDF document text
    • http://ktcz.eu/files/files/8893007523.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/dapuwup.pdfIn PDF document text
    • http://labsshop.com/d/files/sukub.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/zevixiwa.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614e122b25628---80756150447.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-18/210918054742941677our4xgsc3pby.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/13419787527.pdfIn PDF document text
    • http://tion.hu/upload/file/nukujipomikumuvipebo.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b22cd6ea7d---95268115393.pdfIn PDF document text
    • http://czyxchem.com/upload/files/suxufejenuxunesafeworowa.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/31824451163.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d51aa746ed---85679371695.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_off0000b1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BE 10476 bytes
SHA-256: 17d8fc8bfc26ad36910c35ef3cacba8495a1222b086e1c3804177e481900a1fc
font_02_sfnt_off0000e15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15E 16780 bytes
SHA-256: fab64b051840b0fcf6915c3f1d4e36c2841f2e0124535df97bb3bcb31cfabffb

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