Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99d09d93cdc0706…

MALICIOUS

PDF

84.8 KB Created: 2021-09-09 13:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4047545f680761107abc4dbcfe2e04d6 SHA-1: 7355e3ad77e7e6163e2d0b5967a350619492306a SHA-256: e99d09d93cdc07063eb9bf20fc9b6dc900f81c47ab014bbbb7e35bef02f7e340
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URIs, many of which point to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI_IP_LITERAL and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the embedded links and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://hoangphatdanang.com/uploads/image/files/11642666807.pdf In PDF document text
    • http://csc025.com/userfiles/file/20210901212011_lp7s9g.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/zatisasuwi.pdfPDF link annotation
    • http://vxclouds.com/userfiles/file/potililebixotexakanibas.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/jovigorimunemepalakukezes.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/kiwirudibebaviwenaku.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/wajukabiba.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/fazajojewuk.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/74898659394.pdfIn PDF document text
    • http://www.moyekolodin.com/files/wipipexomixazex.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/49843334884.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613449a383f09---18967245074.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/34624758346.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/dedariderexijupavuzi.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/mav0jr4irgg938gve97asq3a1b/21773905273.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/g2e9aqd0h7or26tha3m3tqg595/34948206197.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/2015189898.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/70649878033.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/91541695633.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/bubopegitumabag.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/2bbb92b04a848b1ea9eca45aafc42368/15986437762.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d400df62f---fevuzopozeteko.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/zigabukaxarovaposeko.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/duvisiregufudog.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161330d6a67ccd---satep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=transfer+android+notes+to+new+phonePDF link annotation
    • 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_off0000e762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE762 17656 bytes
SHA-256: 27add4c6e1d146fabf43967eca10f913a5adbf454071b36feb120c8a5e0ad8f7
font_01_sfnt_off000115a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A4 10600 bytes
SHA-256: 7e23d116016af0b55e8212c736791392665ca57506a351bc21fb54deb6bb45a3
font_02_sfnt_off00012ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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