Malicious PDF — malware analysis report

Static analysis result for SHA-256 4943af03871043c9…

MALICIOUS

PDF

86.4 KB Created: 2021-07-20 06:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 58e77e91b1a961cdcaace5d5810152f7 SHA-1: b5bc84869cc4e9e8740e18ffd2a484f036530545 SHA-256: 4943af03871043c9701df201bf240f2975cfa9eac1f17506b7bbc078cbf39750
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/gijunowasizuled.pdf In PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/db9278156ba883f40ade7d473d8f1448/kigipupufikun.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1c7897079---finovopixumezotusimazomot.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093aae81992a---fixegivebanitagogetodev.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/8e2c8311e1f3909c9dfee35ddea100a1/mozonulivasabijekevi.pdfIn PDF document text
    • https://mcitalianwine.com/file/kezobodaxazewemesazedun.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/m07to6hoapsmall41dnit5o0c2/995181190.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/avr734e6hsm6fu5rij8bj24fbs/jobemuzibevewogetovalegom.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/4ce841f97fd61ba57bf60fec9240a682/73525714300.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6920973374---bugivopidu.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46cca21356---70263483072.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/43647541770.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/gp49t2m7se3unfubtmf2su9moj/bufegisoguweramekepasure.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7067c87f72---mumigogap.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/ritixekato.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/vipasafuwop.pdfIn PDF document text
    • http://fotossc.pl/_files/file/76453319842.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/52330703027.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/11369345714.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/rajem.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/e6e682a49ffc79019b0bdc8cd0833781/16690685433.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/tewodezogimag.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/61234776436.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160b731b21db64---renet.pdfIn PDF document text
    • http://efrex.cz/files/file/wuwikinubokivilovil.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe9a895dec---71033186634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=import+and+export+meaning+in+englishPDF 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_off0000ecf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF2 17672 bytes
SHA-256: 47ae8b2dd3c006d897fa2b4039c1569212eb9a177dbc4abbacf20107c61a4ca0
font_01_sfnt_off00011b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13379 10892 bytes
SHA-256: 9d7b76604e04360a2ae3b1a12b66411387f9f4d15ffd90dbc67c9599c9792a42