Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e9bcf95bcf0825…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 22:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9af004aed5e6965d238eaa97e589586f SHA-1: 7f4fb799b2799991d2d5265e7599e9337cee052f SHA-256: b9e9bcf95bcf0825d778328403d62c6abc7e2defdcee7885fb4f8da7bc9cc20b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and embedded links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mooneyes.pl/userfiles/file/baloxidepimuzutexemosewe.pdf In PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a2a6b6b9e---32873729976.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210716190010.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160757e06d9cd0---14646666936.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/75949143854.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/96675tn2ulbd3uucd3t2nv75cd/ledesekivevazirejila.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/vejutozujanamuvagisolub.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/95922992246.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/segoxiwugajur.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/7288168813.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/kajerarugosabetebolekimoz.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ed6f96dd14e1aa5a931c0243b30556ba/18792824217.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/jivobupivijugezubutaf.pdfIn PDF document text
    • http://beiks.info/public/file/1847397769.pdfIn PDF document text
    • http://temple.mo/userfiles/file/57945316844.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/gamujipikemokagozinabanad.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/gepixuzaroka.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/fijekogifowazem.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05ac9d087d---66736895444.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/65130014563.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/nosapava.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/e2ff0be2825c4099b476cd8c3218e92c/30410919370.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16083e4eca1b43---besotokaxapesipalopu.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/2b6cfa5c9e3f1a4d3a84edd6f66f47d9/84487471878.pdfIn PDF document text
    • https://ikansambel.com/contents//files/vebaxojubewazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=noise+pollution+causes+and+effects+pdfPDF 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_off0000dcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEC 16056 bytes
SHA-256: 612f5aa3e4cd0c87f9a7f02a984f10b24523b0ac6089750721a5b5a6d3a8334f
font_01_sfnt_off00010652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10652 10592 bytes
SHA-256: 769a3869e36bb54eb5f32ed37b862685cd1a9f32d811fd5c4002ec607a0c33a1
font_02_sfnt_off00011ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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