Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e5dbd78fdc1b08…

MALICIOUS

PDF

85.5 KB Created: 2021-07-07 04:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 383975fcbf7dede842fcd4f44ebe9168 SHA-1: 3a20d6c57ae12a4f2c7f416797bac87803ad7880 SHA-256: 53e5dbd78fdc1b080242325d2f2ff952194335778811ae5b9135272a009c00ad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL findings point to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/fig77ua3b5i34mq7fn99bsc8t2/jukagekibakaju.pdf In PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8cab1a7ca---9136964703.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721dc9b80bb---29902571574.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/68598866511.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/ea20dacbefa13832abe99be0906537a1/besedure.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fd63b2c45---lukudulebuwekiko.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/32651696094.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741adbbc1f8---lujemap.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb8be52b7c---demuxaxowosamamuni.pdfIn PDF document text
    • https://dm288.rs/slicice/file/98618618578.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/jufev.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/74338712008.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c083eb8ac6f---mekamakibexoluvefiju.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cbe6cf86f---dubawu.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d28ba58c8b6---tilip.pdfIn PDF document text
    • http://splogservice.ru/content/file/65609336039.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/lorugejezivepezujumipo.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/275c5811199d72728f40fd0e75627797/89691649831.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/o8nhfjl2a4gv7l77v6kek3k650/fuvivolelejusatavef.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/909j9ol7uv9m6v98dfpvklgsm0/zasawokewisovuguvoler.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/51835816814.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/fac2c62f9c605904d9b128696fbaecd3/xinigaditutuzuko.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/81230591348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+you+leave+a+discord+serverPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10548 16856 bytes
SHA-256: 3bf561704bc051c724de926e07676b4df19d701b61f2e13b53985355eeb9075e
font_02_sfnt_off000130e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E7 10520 bytes
SHA-256: 8794b7e6f2b8cf9e798e10e116281b4a88d6df1a8bf2bf9b788da2b26c109012

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