Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae151c7d8db1b0ae…

MALICIOUS

PDF

82.6 KB Created: 2021-09-12 06:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d67e2840dbfb18b961fe16b6db9ea37e SHA-1: 9f0342edc61dc34227665f9daf5f67c5b561b8c9 SHA-256: ae151c7d8db1b0aed41aef895664275ea09f007bf809981da7e1abeb5a00c2ca
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to lure users to malicious sites. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule indicate a pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smartpaintingplus.com/userfiles/files/molari.pdf In PDF document text
    • http://www.andreapondika.cz/file/48493640911.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/84796145025.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/36336516243.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/makavizivovopofumibexu.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/guperavujoreloxag.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/2934ce8299817413df1d067d9a3cc86b/93777052878.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/zojili.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/82659023710.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/zozigadudowinatuvav.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/wujawukobewavevitizavebe.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612f647b48b5f---mefunuwi.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210904155821.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307d4296fde---jonabizajib.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe053f6eb---10635356162.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/makuzejevisilozijonivofu.pdfIn PDF document text
    • https://epiphanych.com/images/file/bezexapanux.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/d8e577efd433943de366cff0fd349963/foxizefivoripe.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/34048475587.pdfIn PDF document text
    • https://euchebnici.com/img/file/xokel.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/xiposujepovazafiked.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/rodotuwatunuruwapitiref.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/14852778905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+handmaid%27s+tale+pdfPDF 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_off0000e12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12B 16852 bytes
SHA-256: cfdde796a66bcece9a4afa241d7eeb1af2a8407a90c2e331dd8a63a1acf3f3df
font_01_sfnt_off00010cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC9 10540 bytes
SHA-256: e2b778b1cbf74f9e59155bfab53e8627bad76913cb747e1c9b17b7396954571a
font_02_sfnt_off00012498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.