Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a17a8da0126799c…

MALICIOUS

PDF

75.3 KB Created: 2021-09-09 23:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2489fc1b81850936e9d9f2ca735777f7 SHA-1: eabeb7f7d5686a303bfeb366c0e7210b653ad35a SHA-256: 1a17a8da0126799c99cc810517f34d7d90d93a1cc67ff0f9a73b0779ea38328f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://autopsrus.com/ckfinder/userfiles/files/mogudiwa.pdf In PDF document text
    • http://zh-huaxun.com/uploadfiles/files/zaxefirabelakemi.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/97483537127.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/jenidukakesire.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ced3c9894---95132018970.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/53408979166.pdfIn PDF document text
    • https://blv.by/upload/editor/files/xuwirisebutikoxabu.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/77334076218.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ao1ol1d4oe49q00kbhfrji2th7/55508120746.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/sivigojiweg.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/tisujuluwawe.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/vinilunit.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613607a425a31---jawizeju.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134af2e2e0e5---49042074289.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f0c0e372df0dafc576c906a329807b38/45745886820.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/juvusuwogotepuza.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/56508623909.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49445639366.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/tusebavatol.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/70250150622.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/49900151159.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/67d311458db9a230e093dec14ef29a6d/pazulel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=major+grom+streamingPDF 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_off0000c0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD904 18056 bytes
SHA-256: 969d7235511cb9afd021f8dbe357f4d889bfdf0793d09bf9dc71a731c2a70ef6
font_02_sfnt_off00010849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10849 10528 bytes
SHA-256: f4ab718f4140809f3a22a3bf1814975e1d405fad67764b1c5acda66fa35a2449