Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f0906dcf08efa8…

MALICIOUS

PDF

75.4 KB Created: 2021-06-11 15:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0786fb9a05d5d04d585b1a1c5cb6653a SHA-1: 42cd9025ffc1615528ee8e95ccf4c6dda0bbfb6d SHA-256: d5f0906dcf08efa8a2b592d50799edef78d0e03adbfb86e95a53381866892116
156 Risk Score

Malware Insights

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

This PDF file is classified as malicious by ML models and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised websites, including WordPress upload storage, under the guise of providing 'Sherlock Holmes novels in Malayalam PDF download'. The presence of multiple external URIs and link farms suggests an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://irlanc.ru/uplcv?utm_term=sherlock+holmes+novels+in+malayalam+pdf+download PDF link annotation
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/a8ee8d9eef3c5b8f106951f7d368b52a/85878417236.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ae7vno092h9pbip01vnglkfpi6/93252541488.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/62418404088.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987e815ebed---7386198908.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/sakobusefo.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/82129917023.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083271975d25---75967759266.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/95e8ad9d1aa34f219f26a774ae9b94b7/jebaxovigujidukefaku.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608464ddeef2e---wosinukabo.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/jusuzozi.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/6salpva2ua8rdtuqo4ctlrp240/73614705582.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608297c858453---19729462742.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/299a0f36f476f7eb05c5916795f15749/jekabibimebiwipujom.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/podadirekefiveziwixazeju.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff87429ac3---24404043313.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e68e4401cc---jobekilozanawofori.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/97918586203.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608646377701b---69183630034.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/a16ec07f0bbf8d1d93f1c66deec8bffa/56038668599.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE801 5816 bytes
SHA-256: 1c2836befd4c4b81c6b706cc4d44a4171e5ebe029015a9f1174e73878d215e94
font_01_sfnt_off0000fbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC1 10980 bytes
SHA-256: b1ff4d915c0cf908c610677e6e3f1dc08abada6a340daf60fe272ce907adfb1e