Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c793f046bad089…

MALICIOUS

PDF

98.5 KB Created: 2021-07-31 03:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c005d76d7fba1f1f0d26a7ba9f70102 SHA-1: 1e109ec524cd44dd07e8bdd40e52529c203bcce3 SHA-256: 01c793f046bad089d92dab08f680d0e2be45eb24e41dc2e61f493e0d5a5ecab3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with multiple URLs pointing to compromised CMS upload directories, suggesting an attempt to disguise malicious links. While no scripts were directly extracted, the PDF structure and embedded links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/6a8a078d0578293e037d6d3aa51efd27/1588498926.pdf
    • http://skolicka.eu/foto/images/file/belejixozegagopiw.pdf
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/89174487899.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160796aea6fb5d---17361706750.pdf
    • http://ibtaker.ps/userfiles/file/tuxofuvepuzonunuwaza.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a70e77bf4a---2749092146.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16094d647e517c---4811760015.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/96833850660.pdf
    • http://optykglowacki.pl/obrazki/files/xifolemoj.pdf
    • http://ecandrychow.pl/Image/files/xavumonupajokexugifesu.pdf
    • https://btcauction.vn/hinhanh/file/55745852444.pdf
    • https://tomas-music.com/contents//files/dazabezedazifamuwoj.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b45e72f036---84869334388.pdf
    • http://say-international.eu/userfiles/file/38818458248.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/c93b328be02ce7de86982a0ba447c6ba/vutevikefegapexozuzizato.pdf
    • http://willowslakerhea.org/userimages/49821664733.pdf
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89529673747.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cb08de947---20512423754.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/50a212edb7439345b32f4ffdc09a99d6/54244919004.pdf
    • http://pappteam.hu/userfiles/file/xivujavolapaxa.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/1008067064610991270091fa3945e64f/31809191066.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/65q9t22b9v8to131223k6ene6p/jazulekidama.pdf
    • http://savitapiti.org/ckfinder/userfiles/files/82813394021.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=street+outlaws+who+won+mega+cash+days
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/vaviwupu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ae9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE9 16792 bytes
font_01_sfnt_off00013300.bin
68356a62cb49865e5d0a3c8c7ad84f52ebf5480b5df75aaf900ef294ced50ee3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13300 11100 bytes
font_02_sfnt_off00014c97.bin
4bf7cb1cbfa6bd287382a7f5f42401d471fda07fab7459715c20927915f18362
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C97 18096 bytes