Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62770709875690a…

MALICIOUS

PDF

79.0 KB Created: 2021-09-30 12:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 937586fd0fa47a498ca72cfe9a8b1e03 SHA-1: 2928b40ec1b9bf1dca702205ee166101da3eda8d SHA-256: a62770709875690a0a1af3aa7c861da757a7b48e25a3d0c05a61b87703cdbc4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm on disposable hosting, with multiple external URIs pointing to potentially compromised sites. The presence of embedded URLs and the structure suggest a phishing attempt, likely to redirect users to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://allytemp.ru/uplcv?utm_term=suraj+pe+mangal+bhari+streaming PDF link annotation
    • http://mydreamtuscanwedding.com/editor_up/52121479005.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kidewagumu.pdfIn PDF document text
    • http://zerosquareonline.com/file/nurajoxa.pdfIn PDF document text
    • http://pinxedien.net/upload/files/58222921189.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/45714532436.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161471437aac49---titorebaxodebugexalesop.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/28191123656.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/81832000007.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/neduga.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/koveperevivuzelazagava.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/85281715142.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/3940603521.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/beresetenasan.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd3d139ec---87679740622.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/fopafuwinepevab.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/xevug.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/99604093117.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/12773950400.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/91171914138.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/48727745070.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/30031952862.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3e5f10f0e7ba11fcc10f9ff35be27ac5/75536600619.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/xewosem.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC436 11024 bytes
SHA-256: 36ee9392e277bbdc360344a4934863d92309d75a7e2e92b5a3d9b1a975587a1e
font_01_sfnt_off0000dd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD57 21708 bytes
SHA-256: 8602f476858c6beec9b405c2824facc94eb5d8728c0051d557977b94719da7f5
font_02_sfnt_off00011668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1