Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a86618023c66d0…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 23:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 377debe8a0be9eb6e5a32058a74538eb SHA-1: a050ae5cefaeb93b52de384702d90dca00652fd4 SHA-256: 73a86618023c66d0c57d58116d3d09fa5fb810da4627076a77f01963fe1cf3c1
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a link farm on disposable hosting and a compromised CMS upload link further supports this. No scripts were extracted, but the document's structure and embedded links are sufficient to infer its malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://hotelniagararimini.eu/userfiles/files/gukikobuvemogaja.pdf In PDF document text
    • http://protezas.lt/i/File/55905077002.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/206215647.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/vimitir.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/rapivi.pdfIn PDF document text
    • http://lg-palette.com/upload/files/720532464.pdfIn PDF document text
    • https://partnermind.cz/images/files/ramogolofomefinenapuxoxed.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/14712871096.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/lavetibelop.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210911094415.pdfIn PDF document text
    • https://csn-alliance.com/data/files/xuwosesotakujolew.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/rogolerajilew.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/xelew.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/96678184554.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/podinored.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/42062078284.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613cff6055ab2---53663144971.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/nabululagobavujemiberas.pdfIn PDF document text
    • http://juentai.com/userfiles/files/88961261582.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/7ff31354799a40dba8675b195b592cc1/fiwuxarakozezozebo.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161323b68f3d16---65972694515.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210903180525.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/tafabovuduxa.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a22e50af06---sotepoxudufe.pdfIn PDF document text
    • https://nepaltrekkinginhiIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=pinjara+khubsurti+ka+on+mx+playerPDF 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_off0000d815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD815 11196 bytes
SHA-256: e2d69d389f4bb1aeb96d05008792e75b9fcd6f0f536df5fbfe08478d9aaef316
font_01_sfnt_off0000f1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F6 15924 bytes
SHA-256: 033c502e79d5990aaad4a8557c479eb4f07187e06b8e090ee797c08100e3b161

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