Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac532536fa3fde0a…

MALICIOUS

PDF

85.1 KB Created: 2021-07-13 23:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c1a1ab43e16f2e675506c93ce76549f6 SHA-1: 0cd648cc5d001d6748e6b46a4d9558908ac3bf9b SHA-256: ac532536fa3fde0a589c82dbac59ee4eb5810733d72c4b114ccdbadbd25dc2c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host further PDF files, suggesting a chain of redirection likely intended for phishing or malware delivery.

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://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/8b5840b79d355851b56dceb8badf6e6f/godexepikemij.pdf In PDF document text
    • http://wallsfamily1912.com/clients/876683/File/jaseme.pdfIn PDF document text
    • http://familycrawford.com/clients/3/31/31f1fdc6e90c562b7578e9c437f7c1bf/File/vazazakasofizi.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/b7666895ac03cf1d839db468345d883d/6843983564.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/3962fd030a3659d4b6ffda37dc11a0d8/gasuradapenir.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3c809edba3f6ecfea5abb6cfd94aac92/roxekatopisupexazoj.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/c401a30f963b8a9e5490f67ce690b3d8/kerawuguxogivexo.pdfIn PDF document text
    • http://orthopediedelft.eu/files/pawadawuzesugivonigetuben.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/resekukimazawozusuzufozil.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/59455577724.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/sofofofijuz.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/dotamigaxefuguwetunalulam.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/2826553341.pdfIn PDF document text
    • http://longhornrings.com/clients/0/08/08da48574b41509ac7bedcf2500dc652/File/73462388600.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/51609807610.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607faeb00ea56---suvibulepabuvese.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/guragi.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/3a7464b372f28107d6193bac0a2abd8a/fogenuxoxegefi.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/lokefuvefivobiwusodi.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/toralis.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/vadilatusufepowuxogufoje.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/d8836d58833314a5679e9f383c7956b5/66941852045.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c6ea727e1---19910869942.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/kabapinaw.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bf1c6646c---zatakaxekum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=another+word+for+smellPDF 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_off0000eae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F7 10432 bytes
SHA-256: d512cb468727ab7643d53c89f974b51b8bb626445ae4414fd232f3942d4ed726
font_02_sfnt_off00011a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A80 16628 bytes
SHA-256: 8ac5933309c757f551041ac7cdec35ea7d4d59e09155eef88358f55ccda42913

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