Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c355de74fd77c94…

MALICIOUS

PDF

88.2 KB Created: 2021-08-12 02:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8894b99fad3dc845461d8595ab229088 SHA-1: 3c54a959e677696199228d634f5c5742940566c7 SHA-256: 4c355de74fd77c943fd34b2afbde62f8fe759673e146468ce7a5d7e00d5b4990
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dichocungtoi.com/userfiles/file/tokorowuvaderigovovib.pdf In PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d7f15be8cfbbd67657db6fb3a0752f8c/58594103482.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/rofobevesefavivugisufuvi.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/26561442804.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/99977963482.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/zitopezezakesedixit.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/vadefoxuxoken.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608b67b37e195---71688126343.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/kararoxidogufuxib.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/nirowifakogosunogibu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/7eie7fsojq6g3k0s0ra0nhdth1/wawot.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf94f24fe1---miruwitegugomeru.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/bebaae30b5991bfc14b24f4000ba7437/90084575504.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/3107228836.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/po40nqs1em75mjv9otvcmlign0/sekejoketudezorisa.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/81267919309.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/jazajodavapefa.pdfIn PDF document text
    • http://punaide.com/userfiles/files/90007485317.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/sinafizikujidanoxof.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/da15803a82b9ac4d514c4f42d7e153ac/lujaxemo.pdfIn PDF document text
    • http://unsersohn.ch/images/file/70924213681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+do+i+reset+my+schlage+keypad+deadboltPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d3533b774c04b6fd7ed69cdb34c43052/raweberazudo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AF 17460 bytes
SHA-256: 34ae782dfb2ea84f65e9eee38eff3a9e6fc9bd087210ef6cbaee2a67af245774
font_01_sfnt_off000104ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FF 11280 bytes
SHA-256: b8296561efc4558989907fa94b9fefbca20c9738c31b20a65d45063f2fc3380b
font_02_sfnt_off00011f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1D 17624 bytes
SHA-256: acbb6b66b6d5c5a7917f9136b823b58523ee0c0ea258edb621e0a2231b5dc880
font_03_sfnt_off00013a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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