Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02776832ac219d0…

MALICIOUS

PDF

100.9 KB Created: 2021-08-20 17:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d531a5b1455b2b0db93637946e8b925c SHA-1: a54ae44828ba7eaff2773efc73ffc30174ef897e SHA-256: a02776832ac219d01bf13e711b9b3ba0a66729172576f0db75fe0fde73cc49aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://donateagift.eu/userfiles/file/pajar.pdf In PDF document text
    • http://longthinhphat.net/uploads/files/29542584162.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/nutoxasudopoveleped.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/44509667717.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/nitogunemadubi.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/74724533216.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/c5b2c95656e3521841338f41dc99d526/mafomuzadagemisuv.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4207890aab---zekomapilowod.pdfIn PDF document text
    • http://candientushinko.com/images/file/nasisinifakogasewewovi.pdfIn PDF document text
    • http://anadarkogomezfamily.com/clients/7/76/76920377ef4e0cfe2c6e77079a05cbd4/File/13984680007.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/xozezatomobokipakodemeb.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/21084722112.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/63e130a3f039ae9f47cd0373ebdc452f/84441389359.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/sidedafilikijajuwiguxu.pdfIn PDF document text
    • http://umhouses.com/uploads/files/duvuzudujilulikojatej.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/p37fu9q8m6m2ujde30bd9u7qr5/32664061376.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079b292363af---bajatavisokokezujif.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/630beb1b7168fe22f88add76713546e3/nugebawelovobitawu.pdfIn PDF document text
    • http://fitviewer.biz/files/file/94620152933.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/27671683940.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/e0a900ea3b5080e4a859c1faff580302/83918403821.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/lovuvop.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/jidafovesivogiwimapor.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/5131d8c089a79d4243075dbdd409e22f/20656310570.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/57729409471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what+foods+are+good+for+dogs+with+colitisPDF 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_off00012576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12576 10728 bytes
SHA-256: 00769d9973e7d0bbcdfba5965d2175c65b605be5089d67a969e426b22ca8c46f
font_01_sfnt_off00013e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E20 17948 bytes
SHA-256: 6af30180a9e60f103a61b8a2552d3d57f320165e12a019387783986d5c5e8f3d
font_02_sfnt_off00016d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1