Malicious PDF — malware analysis report

Static analysis result for SHA-256 149c838a19a2c39b…

MALICIOUS

PDF

87.8 KB Created: 2021-09-01 09:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5333ea04c8f881364afa2592365d8a3c SHA-1: 9a524b2821210ed7c15aae7b3f07edef70665a2f SHA-256: 149c838a19a2c39b976349a106d0f83cc27a87c1cbc6299185ca117ade4cce90
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised CMS uploads. The primary purpose is likely to direct users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jackyrouxmethode.com/userfiles/file/semewodirejuduruv.pdf In PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/77037256256.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160773f085543b---79322894375.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/sukufopijirolatoxawi.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/jozukorop.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/79274909894.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/89617953737.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db2dabf2928---60369067161.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/bbaa7aec4287194ec03563fe96b92fd3/83039989510.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/02aaa27514cd53f56476b7461663a987/5781621766.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/7746e9b2a135e8790566a91d7a2c22b4/zebaxumudoj.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/58096873177.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/94712060246.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf11115f54---vuvakujiridolowazedud.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/rlcvolg8l5g9ffmj4k4bi8rd1c/24641358891.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b812f1ae3d6---badel.pdfIn PDF document text
    • https://www.micd.edu.np/ckfinder/userfiles/files/36667014651.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/ede51d2d6e8af35ebb59d110ad42a2e7/42247711884.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/sg3qgmufblsomae5uptdg7tk3e/90084593418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=normal+gfr+rate+per+dayPDF 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_off0000f2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C0 17984 bytes
SHA-256: 72ab7e7e7351c4074d7666d7c6d723ba19505556e66840c6200407c113f96926
font_01_sfnt_off0001219c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B3 10568 bytes
SHA-256: b3e8f948aca624f49e3670d5a0bd745e55213236831fab8488bc36d55e013a69

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