Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7bd6fd18359c0b0…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 22:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f54a14e74afb9357831bb589e91a89b9 SHA-1: 5681a85418965cf94f6c3b55ad0ba2f3150a26c2 SHA-256: a7bd6fd18359c0b02cdfc958abc08c02a6ca695915c8fb54e018949f2607a44f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to direct users to external content. This behavior is consistent with phishing or malware distribution schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://home-consult.lu/userfiles/files/16238954779.pdf In PDF document text
    • http://fueandhair.com/userfiles/files/ketivebineneluwizigedadav.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/31638172199.pdfIn PDF document text
    • http://tfforming.ru/d/files/nubujulupobiwobado.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/vdevd1hle0362hiriu587spjh6/2898945274.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/64342486374.pdfIn PDF document text
    • http://taigesw.com/upload/files/pamuronubakujakuxas.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410ec94edba---95230974737.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4a5700ee7---lesipowumoxex.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/diboxokej.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613444a1ab6e3---15451580714.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/lebosepifisanupug.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/25183766550.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/56667212299.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/12525351198.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/15755501661.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210908_BFDFD6267D82EC9A.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/jojol.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/64047328261.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/9046117526.pdfIn PDF document text
    • https://suksesunited.com/contents/files/gevojopodamemutalav.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/ruwunudos.pdfIn PDF document text
    • http://orenprom.com/img/account/file/27501519121.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/duwikilawezopekan.pdfIn PDF document text
    • http://heizler.hu/files/file/zazaxodav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=kabbalah+unveiled+pdfPDF 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_off0000db76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB76 20252 bytes
SHA-256: f01d065c4d376c038d8ddaca4b837779c037f2ef77dc91fc396435ff0a0db6a7
font_01_sfnt_off00011056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11056 10404 bytes
SHA-256: 1cd7b925597eb6c065491cbe09325b5ea8f81854db0c19dc64d476efb517a76b
font_02_sfnt_off00012787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12787 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1