Malicious PDF — malware analysis report

Static analysis result for SHA-256 741148523f785c84…

MALICIOUS

PDF

90.0 KB Created: 2021-07-23 22:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f0de453c8ac2171b544779b86f96c4ce SHA-1: 30f28e05a6e82a3f8a68ca0c0cd91f7be9a698b3 SHA-256: 741148523f785c8495e80f51207d0357416d7767990e705ef1ecc28ba0ea5955
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised and disposable hosting sites, likely to facilitate the download of further malicious payloads. The presence of embedded URLs and the heuristic findings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.anjhimayath.com/upload/file/34769872574.pdf In PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ede79dc47---45679144128.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/wamukisodarejekunanina.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67153989956.pdfIn PDF document text
    • https://arerp.kr/data/file///nemufozatolelivotafewaka.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/ldcab45876htpad60ej98d6g5l/xomulafosujufudijigiz.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/jifapaladew.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/e9f79fcfa54248557a5ce4983f5e7af4/8019180720.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/ab544dbaca69c68c9a22444127770535/zufujapajid.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/8942948657.pdfIn PDF document text
    • https://digireg.it/upload/55310334038.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/d1742e88c7ff62ca9e2e6c6f584f1b21/mawabuvekotux.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/pti7bp86dv8ehe9de9k9ek9962/82235210083.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/peomgs7lukmj165b8inl8qdonn/rigodakugalijedawuva.pdfIn PDF document text
    • https://sca-kc.net/scauserfiles/files/71344050135.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0e5eabdfa---xoxebevola.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16089c4836aeb1---sowuwinubuwekojiduja.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b29bfcad7dd---84193551477.pdfIn PDF document text
    • https://signika.pl/Upload/file/41396062786.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/23434740370.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/tumafelewedi.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/affb17cef347b42cbc69fbff136ab5b0/37395548715.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4ceac4115---70432210191.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/zaluxibefavirugem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=html+codes+pdf+file+free+download+in+hindiPDF 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_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 17884 bytes
SHA-256: 5343dd4724ecd6a52ff39a7c179c4e9f89d78251025a30a0007719d20d862c86
font_01_sfnt_off0001263f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263F 10960 bytes
SHA-256: 56a0fa685c45cdb9ebf60be2dc8c5d257fe5634398c22e752bbf3e975af0d5a9
font_02_sfnt_off00013f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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