Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ed92baa1c10be3…

MALICIOUS

PDF

87.9 KB Created: 2021-07-31 05:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8afbd4df0726ddc2250a0eb101be1700 SHA-1: 86e26ba30120ec89d9538a75ae913a5a929ba7bb SHA-256: d9ed92baa1c10be31a2a6cf33b5ea543330d6ea18ccd5454ff349cf2506f5c6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs and link farm indicators suggest the document's primary purpose is to redirect users to compromised websites, likely for phishing or malware distribution. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://krisoc.ru/uplcv?utm_term=how+to+connect+my+bluetooth+speaker PDF link annotation
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16096c8f7417cb---bibokanidifinodek.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/30920965000.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c934236cf2b---vetudifuzene.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210529_194510.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/20e98447cd5ba97a3912f275252dcf6f/kumemasepur.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/lixujuxopatera.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/rusopovuji.pdfIn PDF document text
    • https://codecs.roimages/file/ronilur.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db4fc1e1de---pediputem.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/defefujakaseme.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/74411162059.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df1ace7327---25863806459.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/saredof.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/kuwej.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/249d96d4f56b515c75120ad6c3110b41/62566116597.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/vasufujosukob.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/36297373854.pdfIn PDF document text
    • http://apple888.vn/luutru/files/90495178874.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kobutavuzudiwowuvimenopi.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160896d772f6a8---94657963695.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/sazupizudijuranezidon.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1625161955.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_off0000f3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 11072 bytes
SHA-256: 47c8447d8c340be9e5bbb42210da17e30180659f1693a5df4113243f97af230a
font_01_sfnt_off00010d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D56 17164 bytes
SHA-256: 5e835ec11cd9def665e2823e9d016f40fa2bb302d729dea8d959ea084d83a989
font_02_sfnt_off00013a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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