Malicious PDF — malware analysis report

Static analysis result for SHA-256 63026127752f5b30…

MALICIOUS

PDF

84.0 KB Created: 2021-09-04 19:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8786174805ee41d4c0a79873be9dd0c7 SHA-1: 49e00a5aba112dfe78b353932ce174e638b8e6be SHA-256: 63026127752f5b30808dea47a113760e87449fcc6a32534a9f091a651e59cd98
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to malicious content. The presence of multiple links to compromised CMS upload storage indicates a deliberate effort to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/51mqugj9au98v6k9aiso0a8h11/vuxug.pdf In PDF document text
    • http://storemisr.com/uploads/files/geruri.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/88357715306.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/ab370f9d03a48a3b8e73d1222bcfbe52/92118017015.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/26659359164.pdfIn PDF document text
    • http://builderall.info/userfiles/file/29676572265.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14350957175.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/xogoxenepuvexizafatomeb.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/21845850836.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/6162927781.pdfIn PDF document text
    • https://designclarf.it/file/6282857574.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/18727024143.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/33287491164.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/2945675644.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/8f40f653953d9887bcd8c7ba68681d4c/zumoda.pdfIn PDF document text
    • https://bem-sa.com/img/file/mumujigenap.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/4ia227u55gj3n5re1n6h5fnhem/nazodipuxaka.pdfIn PDF document text
    • https://newoptic.mn/uploads/files/54337137743.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/7e3ca9edb03b672dbc734b464c61925a/rumavofe.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/88067781534.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cecf75b4f5---91522989798.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/sitarojetegi.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/dexolapamatipemebe.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///rumopajijebovudiraxin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=winedt+change+default+pdf+viewerPDF 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_off0000e29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAD 17600 bytes
SHA-256: 08d6e5e0c5458e63eb2cf72605a33e23cd063bdc6420bc013906d95c92ce0ddb
font_02_sfnt_off000128c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C8 10856 bytes
SHA-256: 7bf562d8bef83a9959ac8a967ff98772fec1ab841d0b985cbbd50bd10c49b6fb