Malicious PDF — malware analysis report

Static analysis result for SHA-256 28cfe6e72aee5ff9…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 20:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3f22f477917340f37a984f6191545779 SHA-1: 6a679957db5c018115c0c48089c67fd56303d116 SHA-256: 28cfe6e72aee5ff963e4a200fd8980ee794538a2d91ea53aba3681d3bdfd9c63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://garglob.ru/uplcv?utm_term=midpoint+formula+mathworksheets4kids PDF link annotation
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/o0kgkkhi31r3qu7827tap30v0k/roxomigebalarusod.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/19998675553.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/23899176612.pdfIn PDF document text
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/zimipefurabopinoka.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/xoravixijotovi.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/l1esr42j7r6krv94lsov15fmn9/18641828215.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/727c5dc314724aaeb17f3033532af6c3/wumonuguzedinowi.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609261354f0d8---46870847149.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827a7216303---66415282663.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/4e1e582a015cd2470f827bee3a619b9b/niteju.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a637a4f74c---82135521805.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/zulezulumikogon.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/ligoko.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/5e216b4932b6d7ac4c7060a018827930/jofexefotiwibum.pdfIn PDF document text
    • http://guitarenko.fr/img/files/54311669019.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/85511029275.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/jejunejag.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/91708541920.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/qvo9t0t1lgt4n95u54rgrbkqq0/silekuvizuzat.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/72682237208.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/nubagoxodetozasedut.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/50904505053.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/xolewidupija.pdfIn PDF document text
    • http://owtsreunion.com/clients/e/e7/e717deb27d844c69ffc49b2d3c0bb1a5/File/84030488743.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/nefoxelarujomowaxerorikeg.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c754ab3ec---zuxutozeki.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/93116293988.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_off0000d6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FF 11112 bytes
SHA-256: 002eefebfbcfa1ffba562d466684bf1496951361eafd01b0c8e8a53fe00b1ce1
font_01_sfnt_off0000f0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E1 17164 bytes
SHA-256: 909a2f353e09cfde0b5a8f366365b3eac2432c19fc3c6809795fb18c68f82d19

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