Malicious PDF — malware analysis report

Static analysis result for SHA-256 4445b1648a569de7…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 11:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3ffd08bf1694c8612672ae64b765fb15 SHA-1: 834d73b736137436922c80dab609f05b6a0feb07 SHA-256: 4445b1648a569de7c9cb2f016474e351994cb42a166c13c1f4849561c40fb686
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://morabia.fi/images/file/80488775712.pdf In PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/3026333155.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/lifazenuwovepufusi.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139ae66e5aaa---37175617972.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/23865710168.pdfIn PDF document text
    • http://sin-hua.org/userfiles/nuzig.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3439d46f1d2da77a4c63f91c94c4acc7/12113656171.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/patikiwetudajasemewetufib.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/915cfaf89cdb1e3b7d4d47b718cdcb21/83663413787.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210914071133.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/37619159791.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161387e4d4cf38---76916450072.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/binurotoxow.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/46586307644.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/25206944565.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/73445943851.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143e80e7f0f6---vukibixufilu.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/dipewifun.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/28522528415.pdfIn PDF document text
    • http://giaphatmed.com/upload/file/wumeterusuziber.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/22917548186.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/98b1c362ceea4de83b982fb8377b2d9d/bakebifere.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/49469082505.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614401f1413b3---9380248930.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/79134233522.pdfIn PDF document text
    • http://archbot.pl/files/file/86421846760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+turn+on+an+android+phone+without+the+power+buttonPDF 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_off0000e02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02E 10592 bytes
SHA-256: cc3b0138c0f40cecd959818707259108f24301a299102171d35e30957132dc60
font_01_sfnt_off0000f808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 18428 bytes
SHA-256: 14b213e999e7e8400d4731cb35b05a5c2c50dcdcbe5caaf851016a9b62e556d6
font_02_sfnt_off00012810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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