Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a320fa588869fd…

MALICIOUS

PDF

90.8 KB Created: 2021-09-04 22:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1e419bb27ad8fd64c39cb7b024c83a79 SHA-1: 1315b5acd90757b0946273fb8e149bdc564a2f4c SHA-256: 59a320fa588869fd6c06c937a4d8765bd76f81bdefbba99aa78bf70fba9fd5a1
164 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and embedded links are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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://lionkingbali.com/uploads/file/lanijuniv.pdf In PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/544365fc09588268e99c8c13724c3547/bekedosonutawe.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/posevevowinupeve.pdfIn PDF document text
    • http://mastersequipments.com/ckfinder/userfiles/files/bogosexumixozebot.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/49d93f28308a0f949f664525a03913c0/37916107746.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f36c300a3af168165dc5a54c34606475/38640906515.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/54020b540a87ed4c2f38860c1ef5d14c/wijijigukalerogusegeni.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb73885d61---nitufimawusizarogutu.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609094e5dcd01---81030584220.pdfIn PDF document text
    • http://hk-keber.de/images/file/nunasuxugejabo.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084894f2eea0---gugofakuxifalomu.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/38799705130.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/89034583000.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b91e0306b34---lewixagoturubuwat.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/wanovajol.pdfIn PDF document text
    • http://sbairs.com/datas/files/23173071768.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608485e2888a5---12331399903.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/t6o4j138hi4ba9lrnud930dl3e/wifelabadurezirake.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/7663735873.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/896293977.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec46625783---mejejususetem.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/ed70ec5b562b7061c49084dcf65beadd/padijowame.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/74384868371.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/97817015958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=multimedia+presentation+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_off0000ff27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF27 17588 bytes
SHA-256: 2bfe39b778c89d7db4a582461de653136be18227beb665127fe3b3a71058cc03
font_01_sfnt_off00012c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B0 10752 bytes
SHA-256: 6a42e250cb6c71ac79b574b62fc1acaac12597d91d6828cb1547f6925c5a5ce5

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