Malicious PDF — malware analysis report

Static analysis result for SHA-256 0199f6c3dc6a460c…

MALICIOUS

PDF

79.4 KB Created: 2021-09-02 03:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e1cdf7b624bf0cf655ba2371eb79377c SHA-1: cb0537ecfe7152e80e79d8a6b5776c8f294ead92 SHA-256: 0199f6c3dc6a460c68254fc0d6c865d1ddc5de80483a983b2ddb87bc59a04474
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of link farms on disposable hosting. The presence of these links suggests the document is designed to redirect users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://nomylo.ru/uplcv?utm_term=letter+to+husband+during+hard+times PDF link annotation
    • https://mpksieradz.pl/upload/file/48697663343.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fff8ace35---86847305024.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7b87bcadebea8e0f3208a3ec2816a30b/xafegemamimileseso.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/67596983031.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/gugiberelapexe.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210621_005101.pdfIn PDF document text
    • http://manixcnc.com/ckupload/files/wexawikajosojirudajoj.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/dojixarofu.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0db7a8616---puwopuzetaguxolipelera.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/201d6b816418169cb5fee3cb9e5bfa31/soruke.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ien582sv49pevig8eib589i9u6/nawogozumosakatumutuj.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/25157632180.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/86148178935.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/kedemobejaj.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210828073740.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/78482869344.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/ad4266899edad6f872dff23808ee7ee9/sabuzowepa.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/nefojazexafuliloterivutat.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/68433327068.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/hhu9ajsfogf7v20oqms3avqhk8/85885915525.pdfIn PDF document text
    • http://poiskvod.ru/images/file/fadamenatupogi.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/jijejumuk.pdfIn PDF document text
    • http://donelreunion.com/clients/5/59/59051ae02fa593b10ab13f41bf6316a1/File/1919423536.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/vorowakapi.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737d5d71be6---kujixozanuvazazu.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_off0000d3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E7 16556 bytes
SHA-256: fd2ebc2294783c3c4f38d9fc60c50f4bab6c4109e4ff59806b41d982101aafab
font_01_sfnt_off0000fec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC0 10844 bytes
SHA-256: 6c57fe98b01135980bce1ce84d41a31fa1c30b94eac8597dc2f1e0297aeb0260
font_02_sfnt_off0001175f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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