Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de2513018cd5f26…

MALICIOUS

PDF

87.2 KB Created: 2021-08-25 02:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d8b594aee5c0f51a411de0a50968b9ab SHA-1: ea130a2ef4e5be7d36d40ed79d65df536959d30c SHA-256: 3de2513018cd5f2647856f772f2ec045561c6a83913ad43dc0655fb3b0680aa2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The document contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute further malicious content. While no scripts were directly extracted, the malformed stream length heuristic indicates potential exploit activity within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad8e40111---pulaj.pdf In PDF document text
    • https://theurbanthinktank.com/files/woxipaweretej.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/zofixojameb.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210806193037.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/48283587811.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/16750013401.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59301395910.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160accd4b78b64---15558092793.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c0803ec10---14772815723.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/batanixugimofete.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/4bce8dde2a8199b2b608a4712381baf8/53087058813.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/97643870342.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/muwukodoromaxutedusubuda.pdfIn PDF document text
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/90522411635.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/fepugosabiwa.pdfIn PDF document text
    • http://hodori247.com/uploads/files/kejugaxabexusepisapab.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/62543231344.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/28211534c2fb908e64246782e9ad267c/levedokozimolif.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/u4g8v17fgm5lt322namipnkq7q/lefujawik.pdfIn PDF document text
    • http://jpmoto.biz/upload_picture/7189507923.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5fba8ef2d3f9f45785316cb763d33857/zidakexawugo.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608116135d3ee---43989162172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=divi+toolbox+nulledPDF 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_off0000dc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF475 10220 bytes
SHA-256: 8e7615598fa7118cc8a16023a23410615d55a16cce1c7657a509457e0d50185d
font_02_sfnt_off00010b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7D 16660 bytes
SHA-256: 038a3c3e7cf3dc25ed2dac763ba044e6511e8ade75ea9e46e461a74a8ad97993
font_03_sfnt_off00012227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12227 17440 bytes
SHA-256: 186f7b98584851277485b2e908c3ddabed9ce2230c839e9ecd2fdf1766ab1a0f

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