Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c90649bbbc31629…

MALICIOUS

PDF

102.7 KB Created: 2021-08-14 00:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dcd4f9ca0d468b685cb5c9a4c40e0451 SHA-1: f67ed77455915bf1cdab8b1c55ad341a3f9b7cb0 SHA-256: 1c90649bbbc31629fd89a08bb2c5b784cafb87b7ef142013f1746182fca1ff37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, with numerous embedded URLs. The document body is unreadable, but the overall structure and URL analysis suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9892

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 http://healingtown.org/userData/board/file/naselefutanetadife.pdf In PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/ledesoxulujigoki.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/tasidukubamazamedajosuxak.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/nagevadinigawamobukefe.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66e9971da6---75949413784.pdfIn PDF document text
    • http://daydala.com/userfiles/file/50948358594.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071508429052---50378423989.pdfIn PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/83418133104.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161009d41def97---wojafubopapo.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c777c61cb76---3100911337.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080fed58989c---rufoxes.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760445a1c37---xodowiwovoxugemezifezosu.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/risonedirojezifi.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1624486073.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/7b7d1bea15de67eabdec365e73c7ae85/55756995738.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xoxokedo.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/jijirazitivizikaduz.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/gagexed.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/jimibosenewom.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/36521437214.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/6c350996b9b7900d3a189bfc330fcd25/28761765295.pdfIn PDF document text
    • https://beaszemin.com/files/tuwegofikigolorataw.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/90220294629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=thank+you+no+limitz+mp3+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E8 19364 bytes
SHA-256: 31596627f754cf51f805357cad45b812c3ed0998de853a30958847f9979c31a2
font_01_sfnt_off000144b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B1 16232 bytes
SHA-256: b646e4e99f19ac05519abaf59ecb91311bfd919e7d59cfb2ca623a477a188405
font_02_sfnt_off00015a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001724f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1724F 10844 bytes
SHA-256: 4dac8c22fb755b5a89b7fe98b5bd2e3231baf836bb5dab13a1e6781cd94b6f15

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