Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df179c410af0be7…

MALICIOUS

PDF

102.0 KB Created: 2021-07-19 05:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 795edf1684b952831f4888ec75901e14 SHA-1: 150726cd95fd00cd8eae8eaeee6654ff38a269bd SHA-256: 2df179c410af0be70ca0be0b77a35b8bddd19869d458b273d50a9c02b303fa1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of external URIs and the overall structure indicate an attempt to redirect users to potentially malicious content or phishing sites. No scripts were extracted, but the PDF structure itself is leveraged for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://nutronicltd.com/userfiles/file/pibopisetoviripedanulit.pdf In PDF document text
    • https://alutat.com/data/file/noribuvudasokud.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075d9dac1917---ledajinarabenojugajideb.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608442e390080---baxebibubabinivugilimarux.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/v2qv99ilnpn5ubnphrnplrmdt9/84964010922.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a3d893f06---fujaleguwof.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/2662321032.pdfIn PDF document text
    • http://vce34.ru/attachments/file/67636668284.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e3c0cbee49f---85124816860.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/a3507f86d3bf06c1d38d010bad542b79/raxazerawi.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce666f59146---fivivusobavi.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b80040f2b0d---98775889794.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/13e7706199a8a08aa531ec7b83d9d2bb/38289905371.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210702_D94C02BE984C6548.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764914f1560---49136595489.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc279959cd---febomi.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160942313bd23d---44057189053.pdfIn PDF document text
    • http://aimic.com/userfiles/file/gitesafubuduv.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/6336243866.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/17415699252.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a181938626b---sivoxikopudepelituteja.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/f10sg8oecl3bgjb21sskn19fr3/fulamixezedabofoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=cool+minecraft+sky+basesPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/dcf9708e1292de8ac76bd12cdfee96e0/64811870898.pdfIn PDF document text
    • 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_off000112b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B4 17920 bytes
SHA-256: cdde96d30826a0c7d1d5d7b6127dbb73dbb0d16c5ddfcc73be7897660b2a5956
font_01_sfnt_off00014200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A17 10876 bytes
SHA-256: 17799df998ba677dc16c3ac19a13252320be1de6c4d2232c1e5d4bb4cf2f9a42
font_03_sfnt_off00017340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17340 16620 bytes
SHA-256: e0f7a3c70516689cbcf511cdab5aac58eeada13739942aa35c48651041816be9

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