Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de3efd7aa41511b…

MALICIOUS

PDF

76.9 KB Created: 2021-07-05 12:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d2740977f597c2348ae9d33e98c3fb6e SHA-1: cc54f1a56c2b1d9728a3098f715a5e15c8b374f3 SHA-256: 5de3efd7aa41511bb11099ba2de0a4eba69dd00c7156936765551b4387d3b769
156 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 pointing to compromised WordPress upload storage and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and numerous external URLs strongly suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://inwebjor.ru/uplcv?utm_term=one+mole+of+water PDF link annotation
    • https://clinicscrm.com/img/files/jisowu.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/072077dfdabf028e5fe022d8786a8953/kodakisilapofutalok.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/pauhs51jmne5k62l095mqgnt43/sodibi.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/nivunedilanezew.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/ij8qpimh8jd67p5erif22ckc54/94878712321.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f2ec039a3---pujegupofaxip.pdfIn PDF document text
    • http://cortabellanews.com/userimages/16658772471.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/24433980954.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/dawedikopasejogaxo.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jkc7hbm6vmarphs88jlvuq31l2/juwozamorazonojasow.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/bevekivegivuxosa.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acee4246b13---82836593529.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5dcd6c22f---11494891981.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021062923014235.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba309c4c69c---jamogop.pdfIn PDF document text
    • http://demkapi.com/resimler/files/33863515604.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/btoc4u3crrjurhkmb757m0ov1t/12290561414.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/60272584798.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/44118257252.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/lipalun.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/03865eba939103c500fce21cb176d28f/71188510931.pdfIn PDF document text
    • 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_off0000c66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66D 10224 bytes
SHA-256: 7e6af5ac8c013a0aa91b1fff89f6620d1963acc1894f10e44de3c6f4c653dbd4
font_01_sfnt_off0000dd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF580 18988 bytes
SHA-256: 0298f9570feeeb21bc7ea37f28ed27c208dc267d5156a8e618c14fb4b2fd70e7

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