Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a052d2a6ca2b45…

MALICIOUS

PDF

84.8 KB Created: 2021-08-07 12:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c1f1fe9013ad554c6f0c5f779fbea72f SHA-1: f1b121a602d48d53f163461eaaeda72b53d5cb76 SHA-256: 27a052d2a6ca2b4579ef721675780f55f4b0a5b204a0e59c0dbca24ae0302bcd
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b8c47feea---wijofafigekawamase.pdf In PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-23/20210523234250462530.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/jaxepixalexamesululegeni.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/81604807998.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/ld2f1an5rq8b102megejv379c4/rovigiwujanareriwidegiduv.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/zojunafugibawasuvokival.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f57d29b3a4---40496829073.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/99795216360.pdfIn PDF document text
    • https://esz.jp/img/editor/files/kuwikowe.pdfIn PDF document text
    • https://keluargamimpi.com/contents//files/73609207656.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/12847066926.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ag4smd8nm17af8i7opsb4g54mi/remeresuxokevali.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c34d95dda12---75035805295.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/17073190687.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/bijibumerawas.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/24882822679.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b81e7ff2f17---pipunitokulorix.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/9l09s99qecpo301sifki5137m0/61618704092.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/kimewigajiluvib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=does+chrome+have+javascriptPDF 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_off0000e875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE875 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10087 16812 bytes
SHA-256: 6282ecc83251d4f1a49c040cad30fceb471f41e11befd4331a1d709c0d7f5691
font_02_sfnt_off00012c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6C 10688 bytes
SHA-256: 38b4706b810ff22a6067fc92126dd066bc740fab5b5172637fb251a6552fb9b3